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JM Exploration, L.L.C.
Abraxas Petroleum Corporation
Activa Resources L.L.C.
Alamo Energy, L.L.C.
Alamo Operating Company, L.C.
All American Oil & Gas
Ameristate Exploration, L.L.C.
Ameritex Minerals, Inc.
Amexco
Aminex
Anglo-European II Corp.
Apache Corp.
Austin Exploration, Ltd.
AWP Operating Company
Bayshore Exploration, L.L.C.
Beach Tex Oil
Beckham Resources Inc.
Benchmark Oil & Gas Company
Black Forest Energy, L.L.C.
Blue Star Operating
Bommer Engineering Company
BOSS Exploration & Production
Brigham Oil & Gas, L.P.
Broad Oak Energy, L.C.
Broadway Bank
Buccaneer Energy
Burk Royalty Co.
C S V
Caliente Energy LP
Camden Resources, L.L.C.
Carrizo Oil & Gas, Inc
CB Energy, L.L.C.
Chaparral Energy L.L.C.
Chesapeake Energy Corporation
Cimarex Energy Company
CMR Energy, L.P.
Cobia Oil & Gas
Common Resources, LLC
Comstock Oil & Gas
Concord Oil Company
Continental Operating Co.
Crest Resources, Inc.
Croft Exploration
CSB Partners, L.L.C.
Dan A. Hughes Company
Denali Oil & Gas Management, L.L.C.
Dyersdale
Dynamic Production Inc.
Eagle Oil & Gas Co.
East Guadalupe Resources, L.L.C.
Edwin M. Jones Oil Co.
Einex Energy
EnRe L.P.
EOG Resources, Inc.
Escarpment Energy, L.L.C.
Escondido Resources II, L.L.C.
Firstrike Energy
Flatirons Resources, L.L.C.
Frazier Resources Company
Freedom Pipeline
Frost National Bank
Garrison Oil & Gas Ltd.
Gates Mineral Company, Ltd.
Genesis Gas & Oil L.L.C.
Great Texas Crude, Inc.
Greehey & Company
Grey Wolf Drilling Company
Gulftex Energy
Heartland Energy Development Corp.
Howard A. Banks
Hurd Enterprises, Ltd.
Jensen Operating Company, Inc.
Jilpetco, Inc.
John H. White & Associates, Inc.
Kaler Energy Corporation
KEBO Oil & Gas, Inc.
Kerns Petroleum, Inc.
Kestrel Resources, Inc.
Killam Oil Company
LaGrange SWD, LLC
Lewis Energy
Lighthouse Exploration, Inc.
Lively Exploration Company
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Loudon
Operating Company, LLC
MacDiarmid Interests, Ltd.
Magnum Producing & Operating
McCombs Energy, L.L.C.
Mestena Operating, Ltd.
Metano Energy, L.P.
Milagro Exploration
MLC Operating, L.P.
Mortimer Production Company
MPG Petroleum
Nakoma Petroleum
Newfield Exploration, Inc.
New Millennium
Opex Energy, L.L.C.
Orion Drilling Company, L.L.C.
Osborn Heirs Co.
Paul Clevenger, P.E.
Pearsall Operating Company
Penn Virginia Corporation
Petrogas GC, Inc.
Petrohawk Energy
Pioneer Drilling Company
Power Petroleum
Premier Minerals, Inc.
Primavera Resources
Prime Operating Company
Pyr Energy Corp.
Red Arrow Energy, L.L.C.
Reichmann Petroleum Corp.
Republic Resources, L.L.C.
Ricochet Energy, Inc.
RLU Oil & Gas
Rockport Georgetown Holdings, L.P.
Roma Oil & Gas, Inc.
Rosetta Resources
Sage Energy Company
Sanchez Oil & Gas Corporation
Saxet Energy, Ltd.
Schoebaum, Curphy & Scanalan, P.C.
Sea-Lar Management, Inc.
SEV Texas Operating, L.L.C.
Sien Energy
Skyline Oil & Gas, L.L.C.
Smith Production, Inc.
Sonora Resources, L.P.
South Bay Resources
South Texas Operating Company
St. Mary Land & Exploration Company
Steve Thompson
Suemaur Exploration & Production, L.L.C.
SYJ Oil & Gas
T-C Oil Company
TAE Properties, Inc
Talon Development Company
Tejones Operating Company
Texas American Resources
Texas Champion Bank
Texas Independent Exploration Limited
Texas Petroleum Resources
Textron Energy, L.L.C.
Thorp Petroleum Corporation
TNT Engineering, Inc.
Touchstone Resources USA, Inc.
Trio Consulting & Management, L.L.C.
U.S. Enercorp, Ltd.
Ultra Oil & Gas
Valence Operating Company
Ventex Operating Corporation
Venus Exploration, Inc.
Veritas Energy, L.L.C.
Voyager
Welhausen Operating Company, L.P.
Wentworth Energy, Inc.
Western National Bank
Whiting Oil & Gas Corporation
Whittier Energy Corporation
Will Drill Production Co., Inc.
Willo Oil & Gas Exploration
Winn Exploration Co., Inc.
XTO Energy
Zachry Exploration, Ltd.
ZEnergy Inc.
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