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AGIP Petroleum Co. Inc. Apache Corporation
AgipPetroli Aquilo Energy Inc.
Alberta Energy Company, Ltd. ARCO (Atlantic Richfield Company)
Altura Energy Ltd. Aruba Petroleum Incorporated
Amadeus Petroleum NL Aspen Integrated Oil & Gas LLC
Ambra Resources Group Inc. ASTRA Compa?a Argentina de Petr?eo S.A.
Amerada Hess Corporation Avid Oil & Gas Ltd.
American Discovery Energy, Inc. Ayrex Resources Ltd.
American Shoreline, Inc.