Acock/Anaqua Operating Co. AC Exploration Acock Engineering & Assoc., Inc. Acock Operating Limited Ballard Exploration Blackbrush Oil & Gas BP America Prod. Co. Brammer Engineering, Inc. Cabot Oil & Gas Chaparral Energy Century Royalty 2000 GP, LLC Choice Exploration Cummins & Walker Dan A. Hughes Derwen Resources Dominion Exploration & Produ Drill Partners L.P. E&B Resources Edge Petroleum Operating Co. Evolution Operating Co. H.P. Ellsworth O & G Properties El Paso Production Encana Oil & Gas (USA), Inc. Energy Quest Resources EOG Resources, Inc. Erskine Energy LLC ETOCO L.P. Fort Apache Energy First Rock Well Service Geiser Operating Inc. Great Bay GulfTex Energy, LLC Hankey Oil Company Heisey Ventures Holliman Oil Hurd Enterprises, LTD. Jetta Operating Killam Oil & Gas Lamar Oil & Gas, Inc.
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Live Oak Reserves Magnum Producing, L.P. Meridian Resources Mestena Operating Milagro Exploration Neumin Production Company Newfield Exploration Co. Noble Energy Opal Energy, Inc. Coronado Energy Production Petrohawk Energy Phoenix Exploration Company Pioneer Drilling Company Pioneer Natural Resources Pringle Resources Inc. Prolithic Energy Reliance Energy Inc. Royal Production Rutherford Oil Sanchez Oil & Gas Southern Bay Operating Comp Scott, Douglas, McOnninco, L. Shell Exploration & Production Sheridan Production Stephens Production Co. Stroud Production LLC Suemaur Exploration & Production Synergy Oil & Gas, LP Express Oil Unit Corporation United Resources, L.P. Ventex Operating Corp. Voyager Gas Corporation Virtex and Texas Department of Transportation VTEX Energy, Inc. XTO Energy Inc. Weber Energy Winn Exploration
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