• Cgg Holding (U.S.) Inc.
• Home Stake Royalty Corp
• International Petroleum Corp
• Dawson Operating Co
• Multiplex Services Inc
• Seitel Inc
• Tti Industries Inc
• Mesa Capital Corp
• Dawson Geophysical Company
• Monument Resources Inc
• Maxoil Inc
• Sharon Energy Ltd
• First Seismic Corp
• ION Geophysical Corp
• Grant Geophysical Inc
• Green Technology Solutions Inc
• Cass M L Petroleum Corp
• Home Stake Royalty Corp
• Home Stake Oil & Gas Co
• Universal Seismic Associates Inc
• Pgs Asa
• Tag Oil Ltd
• Western Atlas Inc
• Tatham Offshore Inc
• Benson Petroleum Ltd
• Empiric Energy Inc
• Petrobank Energy & Resources Ltd
• Jet Energy Corp
• Seven Seas Petroleum Inc
• Capco Resources Ltd
• Venture Seismic Ltd
• 3-D Geophysical Inc
• Westbridge Energy Corp.
• NXT Energy Solutions Inc
• Forasol Foramer NV
• Petromin Resources Ltd
• World Callnet Inc
• Houston Exploration Co
• Sheridan Energy Inc
• Lerner William
• Cancana Reources Corp.
• Amalgamated Explorations Inc
• Oilex Inc
• Oslo Seismic Services Inc
• Aspen Group Resources Corp
• Sharpe Resources Corp
• Energas Resources Inc
• Ramco Energy PLC
• Newstar Resources Inc
• Talisman Energy Sweden Ab

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