• New Zealand Petroleum Co Ltd
• Noble Energy Inc
• Norcen Energy Resources Ltd
• Norsul Oil & Mining Ltd
• Numac Energy Inc
• Oceanic Exploration Co
• Hondo Oil & Gas Co
• Penn Pacific Corp
• Baytex Energy USA, Inc.
• Caddo International, Inc.
• PDC Energy Inc
• Presidio Oil Co
• Yuma Energy, Inc.
• Ranger Oil Ltd
• Reserve Petroleum Co.
• Carbon Energy Corp
• Santa Fe Snyder Corp
• Seven J Stock Farm Inc
• Alpha Petroleum Exploration Corp
• Southern Mineral Corp
• Caspen Oil Inc
• Centire International, Inc.
• Phoenix Resource Companies Inc
• Tipperary Corp
• Toreador Resources Corp
• Silver Assets Inc
• Transocean Oil Inc
• Triton Energy Corp
• Union Oil Co of California
• U.S. Energy Corp.
• Marathon Oil Corporation
• New Concept Energy Inc
• Windsor Coal Co
• Wiser Oil Co
• Repsol Oil & Gas Canada Inc.
• Standard Energy Corp
• Falcon Oil & Gas Co Inc
• Np Energy Corp
• Oakridge Energy Inc
• Sage Energy Co
• Pxp Producing Co LLC
• Amber Resources Co of Colorado
• Electronic Publishing Technology Corp
• Energen Corp
• Forestar Petroleum Corp
• Oil City Petroleum Inc
• Canargo Energy Corp
• Great American Resources Inc
• Apco Oil & Gas International Inc
• ParaFin CORP

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