• Empire Energy Corp
• Clinton Appalachian X Ltd Partnership
• Aztec Oil & Gas, Inc.
• Parker & Parsley 86-A Ltd
• Parker & Parsley 86-B Ltd
• Parker & Parsley 86-C Ltd
• Independence Resources PLC
• Geodyne Energy Income Ltd Partnership I-C
• Blue Dolphin Energy Co.
• Southwest Royalties Inc Income Fund VI
• Occidental Petroleum Corporation
• Unit Corp
• Enex Oil & Gas Income Program II-9 L P
• Swift Energy Income Partners 1986-A Ltd
• Enex Oil & Gas Income Program II-10 L P
• Geodyne Energy Income Ltd Partnership I-D
• Caprock Corp
• Prudential Bache Energy Growth Fund L P G-1
• Prudential Bache Energy Growth Fund L P G-2
• Bg Group PLC
• Geodyne Energy Income Ltd Partnership I-E
• Swift Energy Income Partners 1986-B Ltd
• Southwest Oil & Gas Income Fund VII a L P
• Parker & Parsley Producing Properties 87-A Ltd
• Parker & Parsley Producing Properties 87-B Ltd
• Vintage Petroleum Inc
• Valero Natural Gas Partners L P
• Southwest Royalties Institutional Income Fund VII-B L P
• Bounty Group Inc
• Geodyne Energy Income Ltd Partnership I-F
• Swift Energy Income Partners 1986-C Ltd
• Basin Industries Inc
• Crimson Exploration Inc.
• Rich Coast Inc
• Swift Energy Income Partners 1986-D Ltd
• United Meridian Corp
• Garnet Resources Corp
• Swift Energy Income Partners 1987-A Ltd
• Enex Income & Retirement Fund Series 1 LP
• Arete Industries Inc
• EOG Resources Inc.
• Par Pacific Holdings Inc.
• Southwest Royalties Inc
• Columbus Energy Corp
• Gulf Exploration Consultants Inc
• Geodyne Energy Income Ltd Partnership II A
• Swift Energy Income Partners 1987-B Ltd
• Enex Income & Retirement Fund Series 2 LP
• Southwest Oil & Gas Income Fund VIII-A L P
• Southwest Royalties Institutional Income Fund VIII B L P

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