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Cabot Oil & Gas Corporation Chinese Petroleum Corporation
Callon Petroleum Company Clayton Williams Energy, Inc.
Camac Holdings, Inc. CMS Energy Corporation
Canada Southern Petroleum Ltd. Consolidated Natural Gas Company (CNG)
Canadian Hunter Exploration Ltd. Coastal Corporation
Canadian Occidental Petroleum Ltd. (CanadianOxy) Combined Resources Group
Carnarvon Petroleum NL Conoco Inc.
Cedyco Corporation Conquest Resources Corporation
Cee Bee Natural Gas Inc. Coplex Resources NL
Centurion Energy International, Inc Crestar Energy Inc.
CGX Energy, Inc. Crispin Energy Inc.
Chesapeake Energy Corporation Cross Timbers Oil Company
Chevron Corporation Curlew Lake Resources Inc.
Chieftain International Cypress Energy Inc.