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Frost Oil Co is a Van Buren, AR-based company in the Energy and Utilities sector.
Marathon Oil Corporation (NYSE: MRO) is an independent international exploration and production company. Based in Houston, Texas, Marathon Oil had net proved reserves at the end of 2011 of 1.8 billion barrels of oil equivalent in North America, Europe and Africa.
Coal Gas Technology Ltd. is a Calgary, AB-based company in the Energy & Utilities sector.
ShaMaran Petroleum Corp. is a Canadian independent oil development and exploration company with a 27.6% interest in the Atrush Block production sharing contract. The Atrush Block is located in the Kurdistan region of northern Iraq.
Shell Oil Company is the United States-based wholly owned subsidiary of Royal Dutch Shell, a transnational corporation "oil major" of Anglo-Dutch origins, which is amongst the largest oil companies in the world.