• Mitchell Energy & Development Corp
• Venus Exploration Inc
• Saba Petroleum Co
• Kestrel Energy Inc
• TXCO Resources Inc
• HKN, Inc.
• Noxso Corp
• Sasol Ltd.
• Geokinetics Inc
• Enex Resources Corp
• PHX Minerals Inc.
• Texas Vanguard Oil Co
• Champion American Energy Reserves, Inc.
• Harcor Energy Inc
• Range Resources Corporation
• Exco Resources Inc
• Conoco Canada Resources Ltd
• Matrix Energy Services Corp
• Patrick Petroleum Co
• Black Dome Energy Corp
• Fieldpoint Petroleum Corp
• CLX Medical, Inc.
• Prima Energy Corp
• Geodyne Resources Inc
• Central Capital Venture Corp
• Colorado Wyoming Reserve Co
• Cedyco Corp
• Hallwood Energy Corp
• Regent Technologies Inc
• Mission Resources Corp
• Tgx Corp
• Territorial Resources Inc
• Devon Oei Operating Inc
• Nahama & Weagant Energy Co
• Midwest Energy Companies Inc
• Solv Ex Corp
• General Energy Resources & Technology Corp
• Golden Oil Co
• Pioneer Oil & Gas
• Silverbow Resources, Inc.
• Cibola Energy Corp
• Questa Oil & Gas Co
• Great Northern Gas Co
• Unioil
• Great Eastern Energy & Development Corp
• CKX Lands Inc.
• Rio Grande Inc
• Cairn Energy USA Inc
• Summit Petroleum Corp
• Puma Energy Inc

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