WINKLER COUNTY, TEXAS
PRODUCTION DATA INFORMATION FOR IN WINKLER COUNTY TEXAS
PARTICIPATING OPERATORS
DONNELLY, GEORGE A. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS WESTERN STATES PRODUCING CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
PHILLIPS PETROLEUM COMPANY PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS DUQUESNE OIL CORPORATION PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
FORT WORTH PIPE & SUPPLY CO. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS PRODUCTION SERVICE CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
SIGMA EXPLORATION CORP., THE PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS MERCANTILE FINANCIAL CORP PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
SKELLY OIL CO. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS HANSON & ALLEN, INC. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
JACKSON, W. P. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS C & S OIL COMPANY PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
SOUTHWESTERN NATURAL GAS, INC. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS TEXACO INC. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
PAN AMERICAN PETROLEUM CORP. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS BEACH & SNODDY PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
AMOCO PRODUCTION COMPANY PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS EXXON CORP. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
WESTBROOK, V. H. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS LYMAN, C. V. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
ATLANTIC RICHFIELD CO. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS MOBIL OIL CORPORATION PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
SHELL OIL COMPANY PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS CHEVRON OIL COMPANY PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
KOCH EXPL.CO.DIV.OF KOCH IND.INC PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS STANDARD OIL COMPANY OF TEXAS PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
UNION OIL COMPANY OF CALIFORNIA PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS KERMIT OIL CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
MALLARD EXPLORATION, INC. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS FURRY OPERATING ACCOUNT PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
PETROLEUM CORPORATION OF TEXAS PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS LORLAN OIL COMPANY PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
TEXAS PACIFIC OIL COMPANY, INC. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS CITIES SERVICE OIL CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
ELLIOTT, B. J. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS RECO DEVELOPMENT CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
COLE, J. D. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS GETTY OIL CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
BROWN, H. L., JR. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS AMOCO PRODUCTION CO.-ANDREWS PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
SUN EXPLORATION & PRODUCTION CO. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS TOPAT OIL CORPORATION PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
PIP PETROLEUM CORP. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS CLINTON OIL CO. PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
SLACK, R. C. PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.
A & B OIL COTTON PETROLEUM CORP. PENNZOIL PETROLEUM COMPANY BEPCO, L.P.
HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC. BAY-TEX OIL CO. MONSANTO COMPANY
CONOCO INC. WOOD, MCSHANE & THAMS CONTINENTAL OIL COMPANY PHOENIX RESOURCES CO.
MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC. ST. CLAIR, D. W. DISCOVERY OPERATING, INC.
MARALO, INC. TEXACO E & P INC. DELTA OIL & GAS COMPANY DESANA CORPORATION, THE
FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC. PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC.
ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON
GOZA, ROGER O. NMR ENERGY LLC TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC
ALTA ENERGY CORPORATION BAXTER, D. B. INC. NORTEX GAS & OIL COMPANY T.G.B., INC.
OGX OPERATING, LLC WESTERN STATES ENERGY CORP. SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY
WHITING OIL AND GAS CORPORATION RIAL OIL CO. HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC.
KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC. CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE
PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC. SEANARD ENERGY COMPANY OXY USA WTP LP
CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY
SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO. WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY
STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC. MLC CO., INC. HERITAGE RESOURCES, INC.
LOVELADY, IKE INC. WOOD & LOCKER, INC. UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY
DINERO OPERATING COMPANY FOREST OIL CORPORATION BLAIR, JACK N. BTA OIL PRODUCERS
MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC.
BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1) HENDON EXPLORATION, INC. TXO PRODUCTION CORP.
RANKIN OIL CO. ANSCHUTZ CORPORATION, THE HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO.
EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC STOUT ENERGY INC. DUNIGAN, JAMES P., INC.
GN&R OPERATORS SAGE ENERGY COMPANY DE SOTO-GLASS OIL CO. FENNO, TOM PROD.
ANADARKO PETROLEUM CORPORATION CARLOW CORP. GILL PETROLEUM CORPORATION POGUE, RANDALL R.
PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION
IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC. HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY
APACHE CORPORATION CHROMA OPERATING, INC. AVRA OIL COMPANY LUCA OIL DRILLING CO., INC.
TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P. M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC.
VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP
LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC. MAS OPERATING CO. MW PETROLEUM CORPORATION
PENWELL ENERGY, INC. LINCOLN ROCK CORP. HANSON CORPORATION THOMAS, J. C.
B & M ENERGY DAMSON OIL CORP. ENERGEN RESOURCES CORPORATION AMINOIL USA INC.
SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC XTO ENERGY INC. CELERO ENERGY, L.P.
OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P. TERRA RESOURCES, INC. MARIAH ENERGY CORP.
UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC. HUFF, JACK SIMPSON BROS. OIL CO.
CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO. OLSEN ENERGY INC. MERCURY EXPLORATION CO.
PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN
GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO. POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P.
DUDLEY OIL CO. BEACH EXPLORATION, INC. SDG RESOURCES L.P. ROCA OPERATING, INC.
KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY JET DISPOSAL SYSTEM, INC. HERRING, RAY
TOWNER PETROLEUM COMPANY WORTHAM, E. H. OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR.
SUPRON ENERGY CORP. BANAM CORPORATION RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC
ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC.
FELMONT OIL CORP. TEMPO ENERGY, INC. CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC
PROPEL ENERGY, LLC HILLIN PROD. CO. G P II ENERGY, INC. EXXON CORP. - MIDLAND
CIMAREX ENERGY CO. MR OIL COMPANY MERIDIAN OIL INC. HANOVER MANAGEMENT CO.
EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC. A & B OIL COTTON PETROLEUM CORP.
PENNZOIL PETROLEUM COMPANY BEPCO, L.P. HIGHLAND RESOURCES, INC. TMBR/SHARP DRILLING, INC.
BAY-TEX OIL CO. MONSANTO COMPANY CONOCO INC. WOOD, MCSHANE & THAMS
PHOENIX RESOURCES CO. MITCHELL ENERGY CORPORATION TOLTEC OIL & GAS, INC.
ST. CLAIR, D. W. DISCOVERY OPERATING, INC. MARALO, INC. TEXACO E & P INC.
DELTA OIL & GAS COMPANY DESANA CORPORATION, THE FIRST RESERVE OIL & GAS CO SELL-RASMUSSEN OPERATING, INC.
PECOS OPERATING COMPANY, LLC HORST & MCKNIGHT, INC. ESTORIL PRODUCING CORPORATION WESTWOOD RESOURCES COMPANY
CIMAREX ENERGY CO. OF COLORADO HOOD, SHIRLEY BRUNSON GOZA, ROGER O. NMR ENERGY LLC
TEXAS OIL & GAS CORP. ARRINGTON,DAVID H. OIL & GAS,INC ALTA ENERGY CORPORATION BAXTER, D. B. INC.
NORTEX GAS & OIL COMPANY T.G.B., INC. OGX OPERATING, LLC WESTERN STATES ENERGY CORP.
SUN EXPL. & PROD. CO.-MIDLAND PRIZE OPERATING COMPANY WHITING OIL AND GAS CORPORATION RIAL OIL CO.
HERITAGE GATHERING CORPORATION CLEMENTS ENERGY, INC. KOIL DRILLING, INC. DALLAS SUNBELT OIL & GAS, INC.
CHEVRON U. S. A. INC. CHASE AVENUE CORPORATION, THE PHOENIX HYDROCARBONS OPERATING KEYSTONE ENERGY OIL & GAS, INC.
SEANARD ENERGY COMPANY OXY USA WTP LP CARTER FOUNDATION PROD. CO. YEATES, BOB CORPORATION
BOYD, D. K. OIL AND GAS CO.,INC. BROCK, HIGHLAND, EQUITY SILVER HILL ENERGY PARTNERS, LLC STALEY OPERATING CO.
WESTERN OIL AND GAS DEV. CO. DESOTO OIL COMPANY STEPHENS, AUTRY C. CAPROCK EXPLORATION, INC.
MLC CO., INC. HERITAGE RESOURCES, INC. LOVELADY, IKE INC. WOOD & LOCKER, INC.
UNOCAL KEYSTONE GAS STORAGE, LLC GREAT WESTERN DRILLING COMPANY DINERO OPERATING COMPANY FOREST OIL CORPORATION
BLAIR, JACK N. BTA OIL PRODUCERS MOBIL PRODUCING TX. & N.M. INC. EEX CORPORATION
CHESAPEAKE OPERATING, INC. OAKLAND PETROLEUM OPER CO., INC. BRECK OPERATING CORP. CABLE TOOL DRILLING CO. (1)
HENDON EXPLORATION, INC. TXO PRODUCTION CORP. RANKIN OIL CO. ANSCHUTZ CORPORATION, THE
HILLIN-SIMON OIL COMPANY PENNZOIL EXPLORATION & PROD. CO. EXCHANGE AVENUE PRODUCTION CO. OXY PETR. INC
STOUT ENERGY INC. DUNIGAN, JAMES P., INC. GN&R OPERATORS SAGE ENERGY COMPANY
DE SOTO-GLASS OIL CO. FENNO, TOM PROD. ANADARKO PETROLEUM CORPORATION CARLOW CORP.
GILL PETROLEUM CORPORATION POGUE, RANDALL R. PETROLEUM CAPITAL, L.C. TWIN EAGLE OIL CORPORATION
BHP PETROLEUM (AMERICAS) INC. SAXET OIL CORPORATION IP PETROLEUM COMPANY, INC. WALSH & WATTS, INC.
HENRY RESOURCES LLC BLUE STAR OPERATING COMPANY APACHE CORPORATION CHROMA OPERATING, INC.
AVRA OIL COMPANY LUCA OIL DRILLING CO., INC. TITAN RESOURCES I, INC. AMERICAN PROCESSING, L.P.
M. M. OIL COMPANY YEATES, BOB OIL & GAS, INC. VADO ENERGY, INC. PARKER & PARSLEY DEVELOPMENT L.P
MINERAL DEVELOPMENT, INC. CORKRAN ENERGY, LP LEECO ENERGY & INVESTMENTS INC. MIDLAND ENERGY, INC.
MAS OPERATING CO. MW PETROLEUM CORPORATION PENWELL ENERGY, INC. LINCOLN ROCK CORP.
HANSON CORPORATION THOMAS, J. C. B & M ENERGY DAMSON OIL CORP.
ENERGEN RESOURCES CORPORATION AMINOIL USA INC. SOUTHWEST ROYALTIES, INC. CROWNQUEST OPERATING, LLC
XTO ENERGY INC. CELERO ENERGY, L.P. OGX RESOURCES LLC DEVON ENERGY PRODUCTION CO, L.P.
TERRA RESOURCES, INC. MARIAH ENERGY CORP. UMC PETROLEUM CORPORATION HALLWOOD PETROLEUM, INC.
HUFF, JACK SIMPSON BROS. OIL CO. CUSTER & WRIGHT OPERATING, INC. ROTARY OIL & GAS CO.
OLSEN ENERGY INC. MERCURY EXPLORATION CO. PETRO-HUNT, L.L.C. RANGER 40 PETROLEUM, LLC
PETROLEUM TECHNICAL SERVICES CO. BURLINGTON RES O&G CO-PERMIAN GIFFORD, MITCHELL & WISENBAKER ARCO OIL & GAS CO.
POGO PRODUCING COMPANY PARKER & PARSLEY PRODUCING L.P. DUDLEY OIL CO. BEACH EXPLORATION, INC.
SDG RESOURCES L.P. ROCA OPERATING, INC. KILROY COMPANY OF TEXAS, INC. LARIO OIL & GAS COMPANY
JET DISPOSAL SYSTEM, INC. HERRING, RAY TOWNER PETROLEUM COMPANY WORTHAM, E. H.
OCCIDENTAL PERMIAN LTD. HENDON, WILLIAM E., JR. SUPRON ENERGY CORP. BANAM CORPORATION
RUST OIL CORP. MIDLAND SOUTHWEST COLD LAKE INC ENDEAVOR ENERGY RESOURCES L.P. SANDRIDGE EXPL. AND PROD., LLC
QUANTUM RESOURCES MANAGEMENT,LLC PETRUS OPERATING CO., INC. FELMONT OIL CORP. TEMPO ENERGY, INC.
CAMTERRA RESOURCES, INC. BOLD ENERGY II LLC PROPEL ENERGY, LLC HILLIN PROD. CO.
G P II ENERGY, INC. EXXON CORP. - MIDLAND CIMAREX ENERGY CO. MR OIL COMPANY
MERIDIAN OIL INC. HANOVER MANAGEMENT CO. EDISTO RESOURCES CORPORATION PECOS OPERATORS, INC.