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  Amoco ARCO Bechtel Incorporated Bush Oil Company California Energy Company Caza Drilling Chevron Cities Services Company Conoco Exploration Crutcher-Tufts Drilltek Equilon Refining Exxon Gary Drilling Getty Oil Company Macphereson Energy Mobil Occidental Oil and Gas Sohio Petroleum Stockdale Oil and Gas Stoker Resources Texaco Exploration and Production Texaco Refining and Marketing Trio Petroleum Unocal Exploration Williams Brothers Companies |
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