• Atwood Oceanics Inc
• Reunion Resources Co
• Global Marine Inc
• Helmerich & Payne, Inc.
• Parker Drilling Co
• Reading & Bates Corp
• Rowan Companies plc
• Sedco Inc
• Tucker Drilling Co Inc
• Dyco 1978 Oil & Gas
• Unit Drilling & Exploration Co
• Transocean Offshore Inc
• Ensco plc
• Medco Health Corp
• United Trans Western Inc
• Potomac Energy Corp
• Apache Petroleum Partnership 1980-I Ltd
• Statmon Technologies Corp
• Hilltop Energy, LLC.
• C&K 1980 Fund B Ltd
• Grey Wolf Inc
• Pioneer Energy Services Corp.
• Arch Petroleum Inc
• Trinity Industries Leasing Co
• Sanchez O Brien 1981-A Drilling Co
• Double River Oil & Gas Co
• Bonray Drilling Corp
• Texland Drilling Program 1981
• Van Harbour International Inc
• Crown Jewel Resources Corp
• C&K 1981 Fund a Ltd
• C&K 1981 Fund B Ltd
• Sterling Gas Drilling Fund 1981
• Brighthouse Separate Account A
• Great-West Funds Inc
• Franklin Energy 1982 Drilling Program
• Dyco Oil & Gas Program 1981-1
• Dyco Oil & Gas Program 1981-2
• Osage Energy Inc
• Sterling Gas Drilling Fund 1982
• May Drilling Partnership 1983-1
• May Drilling Partnership 1983-2
• May Drilling Partnership 1983-3
• Parker & Parsley 82 I Ltd
• Dyco Oil & Gas Program 1983-2
• Parker & Parsley 82 II Ltd
• Dyco Oil & Gas Program 1982-1 Limited Partnership
• Dyco Oil & Gas Program 1982-2 Limited Partnership
• Dyco Oil & Gas Program 1983-1
• Sterling Drilling Fund 1983-1

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