C D Exploration Inc. C. L. Brittan & Associates Inc. Cactus Funding Corp. Cade Oil & Gas LLC. Caib Financial Advisers SP. ZOO. Calcrude Oils Ltd. Calibre Energy Inc. California Natural Gas Storage LLC. Calpine Corp. Calsilite-Ruston Inc. Calver Resources Cambridge Energy Corp. Canacol Energ Inc. Canadian Forest Oil Ltd. Canadian Imperial Bank of Commerce Canadian Occidental Petroleum Canadian Talon Resources Ltd. Candax Energy Inc. Cantera Resources Inc. Capco Energy Inc. Capital C Energy LLC. Capsa Cargill Financial Services Corp. Carnes Oil Corp. Carrizo Oil & Gas Inc. Carscallen Lockwood LLP. Caspian Energy Corp. Castle Energy Corp. Cavell Energy Corp. Cayman International Exploration Co. CDS Energy SA. CDX Gas LLC. Celero Energy Celtic Oil & Gas Inc. Centurion Energy International CER Corp. Challenger Minerals Inc. Champion International Co. Chaparral Energy Inc. Chase Manhattan Bank Chemical Bank Chernogorskye Limited Liability Co. Chesterfield Energy Corp. Chevron Corp. Chi Energy Inc. Chilton Energy Choctaw II Oil & Gas Ltd. Chotin Asset Management Corp. Cimarex Energy Co. CIS Oil & Gas City and County of Denver (Colorado) City of Broomfield City of Longmont Clanahan, Tanner, Downing & Knowl Classic Oil & Gas Inc. Clean Energy Systems Inc. CLK Co. Clyde Petroleum Exploratie BV. CMS Energy Inc. CNG Producing Co. CNR International Ltd. Coalinga Corp. Cockrell Oil Corp. Coffield, Ungaretti and Harris Coho Energy Inc. Cold Lake Resources Ltd. Collarini Engineering Inc. Collins & Ware Inc. Colorado State Land Board Colton Gulf Coast Inc. Columbia Natural Resources Corp. Cominco Fertilizers Compania General de Combustibles SA. Compass Operating Concept Energy Corp. Concord Oil Co. Concordia Resources Inc. Condor Petroleum Conocophillips Co. Conrad & Patricia Tvedt Consolidated Eurocan Ventures Ltd. Consolidated Petroleum Partners Inc. Contango Oil & Gas Co. Continental Resources Inc. Contrarian Capital Management Conwest Exploration (Delaware) Inc. Coomooroo Exploration (Delaware) Inc. Copano Field Services Copeland, Cook, Taylor and Bush Coral Energy Cordillera Energy Partners Cornerstone Private Capital Cotton Valley Resources Corp. Courag Energy Cowry Enterprises Ltd. Crane Holdings Inc. Credit Lyonnais Crescendo Resources LP. Crete Oil Co. Inc. Crimson Resources Crow Creek Energy LLC. CRSS Capital Inc. Crutcher - Tufts Production Co. CSV Holdings Inc. CTS Properties Cventures Inc. Cymraec Resources Inc. Cypress Petroleum Consultants |
C N G Producing Co. Cabot Oil & Gas Corp. Caddis Capital Cadence Production Inc. Cairn Energy PLC. Calgary Louisiana Energy LLC. California Bank & Trust Callon Petroleum Co. Calpine Natural Gas Co. Calvalley Petroleum Ltd. Cambrian Capital Corp. Camden Reserves Inc. Canadian 88 Energy Corp. Canadian Hunter Exploration Ltd. Canadian Natural Resources Ltd. Canadian Petroleum International Resources Ltd. Canadian Venture Exchange Cano Petroleum Inc. Canyon Energy Inc. Capex SA. Capital Risk LLC. Cargill Energy Carl Oil and Gas Co. Carpatsky Petroleum Carrolton Resources Casa Inglesa Ltd. Castex Energy Inc. Castle Peak Resources LLC. Caxton-Iseman Capital Inc. Cazador Reserves Inc. CDX Energy LLC. CE Arco Energy Corp. Celsius Energy Co. Central Oklahoma Oil & Gas Co. Century Offshore Management Corp. Chadmatt Resources Corp. Chamaelo Energy Inc. Chandler Energy Inc. Charger Resources Chase Petroleum Ltd. Cheniere Energy Inc. Chesapeake Energy Corp. Chestnut Ridge Storage LLC. Cheyenne Petroleum Co. Chieftan Capital Management Inc. Choctaw Corp. Chorney Oil Co. CIBC World Markets Corp. Circumpacific Energy Corp. Citicorp Securities Inc. City Investing Co. Ltd. City of Houston City Oriente Clarity Energy Ltd. Clayton Williams Energy Cleveland-Cliffs Inc. Club Oil & Gas Ltd. CM Production LLC. CNC Compania de Nitrogeno de Cant CNOOC Coal Creek Minerals LLC. Coastal Oil & Gas Corp. Cody Energy LLC. Cogen Technologies Cola Resources LLC. Coleman Oil & Gas Inc. Collier Resources Co. Colorado Interstate Gas Co. Colt Resources Corp. Columbia Gas Transmission Corp. Comerica Bank Commonwealth Oil & Gas Co. Ltd. Compass Bank Comstock Resources Inc. Concord Energy Corp. Concord Operating Inc. Condor Exploration LLC. Conoco Inc. Conquest Resources Corp. Consolidated Edison Co. of New York Inc. Consolidated Oil & Gas Inc. Constellation Energy Continental Land & Fur Co. Inc. Contour Production Co. Convest Energy Corp. Coogee Chemicals Pty. Ltd. Coors Energy Co. Copano Gathering System Coplex Group of Cos. Cordex Petroleums Inc. Corenergy Corpus Christi Natural Gas Co. Cottonwood Production Corp. Covington and Burling Cox & Perkins Exploration Inc. Crawford County Oil LLC. Credit Suisse Crescent Crimson Exploration Inc. Cronus Offshore Inc. Crow Horizons Co. Cruiser Oil & Gas Ltd. Crystal Oil Co. CTI Petroleum Canada Inc. CV Emerald Co. CXY Energy Inc. Cypress E & P Corp. Cyprus Power Corp. |