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Oil and Gas Exploration and Production Business Contracts

Apache Corp.

• 401(k) Savings Plan - Apache Corp. (Oct 28, 2010)
• 5151 San Felipe Road (Houston, TX) Sublease Agreement - Apache Corp. and IWC Services Inc. (Feb 28, 1997)
• Bylaws - Apache Corp. (Jul 21, 2011)
• Omnibus Equity Compensation Plan - Apache Corp. (Jan 01, 2011)
• Retirement Plan - Outside Directors - Apache Corp. (Jul 21, 2011)
• Underwriting Agreement - Apache Corp. (Nov 30, 2010)

Brown Tom Inc.

• 1993 Stock Option Plan - Tom Brown Inc.
• 1993 Stock Option Plan - Tom Brown Inc. (May 09, 2001)
• 1999 Long Term Incentive Plan - Tom Brown Inc.
• 1999 Long Term Incentive Plan - Tom Brown Inc. (May 09, 2001)
• 401(k) Retirement Plan - Tom Brown Inc. (Dec 31, 1999)
• Agreement and Plan of Reorganization - Tom Brown Inc., K N Production Co. and K N Energy Inc. (Jan 30, 1996)
• Bylaws - Tom Brown Inc. (May 09, 2001)
• Certificate of Incorporation - Tom Brown Inc. (May 21, 1996)
• Certificate of Incorporation - Tom Brown Inc. (May 24, 1999)
• Credit Agreement - Tom Brown Inc., Chase Manhattan Bank, Bank of America NA, U.S. Bank NA and Bank of Nova Scotia (Jun 29, 2000)
• Credit Agreement - Tom Brown Inc., Chase Manhattan Bank, NationsBank of Texas NA and U.S. Bank NA (Apr 16, 1998)
• Deferred Compensation Plan - Tom Brown Inc. (Feb 28, 2001)
• Employment Agreement - Tom Brown Inc. and Donald L. Evans (Jun 30, 1998)
• Employment Agreement - Tom Brown Inc. and Donald L. Evans (Dec 31, 1996)
• Employment Agreement - Tom Brown Inc. and James D. Lightner (May 02, 1999)
• Exchange Agreement - Presidio Oil Co., Presidio Exploration Inc., Presidio West Virginia Inc., Palisade Oil inc and Tom Brown Inc. (Aug 04, 1996)
• Exchange Agreement - Presidio Oil Co., Presidio Exploration Inc., Presidio West Virginia, Palisade Oil Inc. and Tom Brown Inc. (Aug 19, 1996)
• Exchange Agreement - Presidio Oil Co., Presidio Exploration Inc., Presidio West Virginia, Palisade Oil Inc. and Tom Brown Inc. (Sep 04, 1996)
• Exchange Agreement - Presidio Oil Co., Presidio Exploration Inc., Presidio West Virginia, Palisade Oil Inc. and Tom Brown Inc. (Nov 19, 1996)
• Pre-Acquisition Agreement - Tom Brown Inc. and Stellarton Energy Corp. (Dec 12, 2000)
• Purchase and Sale Agreement - Genesis Gas & Oil LLC and TBI Production Co. (Sep 30, 1997)
• Purchase and Sale Agreement - Union Oil Co. of California and Tom Brown Inc. (Jun 07, 1999)
• Registration Rights Agreement - Tom Brown Inc. and K N Energy Inc. (Jan 30, 1996)
• Severance Agreement - Tom Brown Inc. (May 09, 2001)
• Severance Agreements - Tom Brown Inc. and Donald L. Evans, William R. Granberry, Peter R. Scherer, Thomas W. Dyk, Bruce R. DeBoer, Clifford C. Drescher, Richard B. Porter, R. Kim Harris, B. Jack Reed and William H. Munn II (Jun 30, 1998)
• Severance Plan - Tom Brown Inc. (Jun 30, 1998)
• Severance Plan - Tom Brown Inc. (May 09, 2001)
• Stock Ownership and Registration Rights Agreement - Union Oil Co. of California and Tom Brown Inc. (Jun 28, 1999)
• Wild Horse Limited Liability Company Agreement - K N Energy Inc. and Tom Brown Inc. (Jan 30, 1996)

Chevron Corp.

• Amended and Restated Bylaws - Chevron (May 26, 2010)
• Chevron Financial Statement on Tax Deferred Savings Plan (Mar 22, 2011)
• Chevron Form 11-K (Mar 27, 2011)
• Chevron Form 8-K (Jun 01, 2011)
• Class B Stock Purchase Agreement - Dynegy Inc. and Chevron U.S.A. Inc. (Apr 16, 2000)
• Employment Agreement with Charles A. James - Chevron (Oct 03, 2002)
• Long-Term Incentive Award Agreement - Chevron (Feb 25, 2010)
• Restricted Stock Unit Award Agreement - Chevron (Feb 25, 2010)
• Retainer Stock Option Agreement - Chevron (Feb 25, 2010)
• Shareholder Agreement - Dynegy Inc. and Chevron U.S.A. Inc. (Jun 13, 1999)
• Termination Agreement with Charles A. James - Chevron (Dec 09, 2009)

ChevronTexaco Corp.

• Purchase Rights Agreement - Dynegy Inc and ChevronTexaco Corp. (Nov 08, 2001)

Dynegy Inc.

• Agreement and Consent - Dynegy Inc., Enron Corp., Northern Natural Gas Co., Citicorp U.S.A. Inc., JPMorgan Chase Bank (Nov 18, 2001)
• Agreement and Plan of Merger - Dynegy Inc. and Enron Corp. (Nov 08, 2001)
• By-Laws - Dynegy Inc. (Feb 01, 2000)
• Exchange Agreement (Amendment) - Dynegy Inc. and Enron Corp. (Nov 18, 2001)
• Exchange Agreement - Dynegy Inc. and Enron Corp. (Nov 08, 2001)
• Option Agreement - Enron Corp. and Dynegy Inc. (Nov 08, 2001)
• Purchase Option Agreement (Amendment) - Enron Corp., Dynegy Inc., Northern Natural Gas Co. (Nov 18, 2001)
• Purchase Option Agreement - Enron Corp. Dynegy Inc., Northern Natural Gas Co. (Nov 08, 2001)

Harken Oil & Gas Inc.

• Acquisition Proposal Letter - Huffco Group Inc. and Harken de Colombia Ltd. (Jul 31, 1994)
• Agreement and Plan of Merger - Harken Energy Co. and Xplor Energy Inc. (Aug 18, 1999)
• Agreement and Plan of Merger - Harken Energy Corp. and Search Exploration inc. (Nov 07, 1994)
• Agreement of Sale and Purchase - Yellowhouse Project Co. and Harken Energy West Texas Inc. (Oct 04, 1995)
• Asset Purchase and Sale Agreement - Enervest Acquisition-II LP, Harken Energy Corp. and Harken Exploration Co. (Jul 09, 1996)
• Asset Purchase and Sale Agreement - St. Martinville Partners Ltd., Bargo Energy Co., Harken Energy Corp. and Harken Exploration Co. (May 18, 1998)
• Assignment of Overriding Royalty Interest - Dobbins Partners LP and Search Exploration Inc.
• Assignment of Overriding Royalty Interest - Langston Investments Inc. and Search Exploration Inc.
• Assignment of Overriding Royalty Interest - O'Donnell & Masur and Search Exploration Inc.
• Association Contract - Empresa Colombiana de Petroleos (ECOPETROL) and Harken de Colombia Ltd. (Feb 21, 1998)
• Association Contract - Empresa Colombiana de Petroleos (ECOPETROL) and Harken de Colombia Ltd.
• Association Contract - Empresa Colombiana de Petroleos (ECOPETROL) and Harken de Colombia Ltd. (Nov 16, 1995)
• Association Contract - Empresa Colombiana de Petroleos (ECOPETROL) and Harken de Colombia Ltd. (Feb 17, 2002)
• Concession and Lease Purchase Agreement - C A B Resources Inc., Crusader Inc., Australian Hydrocarbons Inc. and Harken Energy Corp. (Jul 31, 1994)
• Concession and Lease Purchase Agreement - Paroo Petroleum (USA) Inc. and Harken Energy Corp. (Mar 30, 1995)
• Development Finance Agreement - Harken Energy Corp. and Harken Capital Corp. (Dec 23, 1997)
• Development Finance Agreement - Harken Energy Corp., Arbco Associates LP, Offense Group Associates LP, Kayne, Anderson Nontraditional Investments LP and Opportunity Associates LP (Oct 11, 1995)
• Development Finance Agreement - Harken Energy Corp., EnCap Energy Capital Fund III LP, EnCap Energy Capital Fund III-B LP, BOCP Energy Partners LP and Energy Capital Investment Co. (Oct 16, 1997)
• Drilling Contract - Harken de Colombia Ltd. and Marlin Colombia Drilling Co. Inc. (May 14, 1997)
• Drilling Contract - Harken de Colombia Ltd. and Parker Drilling Co. Intl. Ltd. (Jul 21, 1997)
• Exchange Agreement - Harken Energy Corp., Harken Capital Corp., Sidro SA, Lambertine Holdings Ltd. and Rauscher Pierce & Clark (Guernsey) Ltd. (Dec 23, 1997)
• Exchange Agreement - Momentum Operating Co. and Harken Exploration Co. (Jul 10, 1996)
• Partial Settlement and Conversion Agreement - Concorde Financial Corp. and Search Exploration Inc.
• Partial Settlement and Conversion Agreement - EnCap Investments LC and Search Exploration Inc.
• Partial Settlement and Conversion Agreement - Joseph F. Langston Jr. and Search Exploration Inc.
• Promissory Note - Harken Exploration Co. and Momentum Operating Co. Inc. (Dec 19, 1995)
• Purchase and Sale Agreement - Momentum Operating Co., Harken Exploration Co. and Harken Energy Corp. (Dec 14, 1995)
• Purchase and Sale Agreement - Republic Resources Inc. and Harken Energy Corp. (Jan 30, 2002)
• Restructuring and Sale Agreement - Harken Energy Corp., Harken Energy West Texas Inc., Internationale Nederlanden (U.S.) Capital Corp., New England Mutual Life Insurance Corp., and EnCap 1989-I LP (Oct 04, 1995)
• Rights Agreement - Harken Energy Corp. and ChaseMellon Shareholder Services LLC (Apr 05, 1998)
• Securities Purchase Agreement - Harken Energy Corp. and RGC International Investors LDC (Apr 08, 1998)

Occidental Petroleum Corp.

• Acknowledgment Letter - Effect of Write-Down on Return on Equity Incentive Award - Occidental Petroleum Corp. (Aug 04, 2011)
• Certificate of Incorporation - Occidental Petroleum Corp.
• Employment Agreement - President - Occidental Petroleum Corp. (Jan 28, 2010)
• Long-Term Incentive Award Agreement - Occidental Petroleum Corp. (Jul 15, 2009)
• Long-Term Incentive Plan - Occidental Petroleum Corp. (Oct 13, 2010)
• Note - Occidental Petroleum Corp. (Aug 18, 2011)
• Officers' Certificate - Occidental Petroleum Corp. (Aug 18, 2011)
• Prospectus Supplement - Occidental Petroleum Corp. (Aug 15, 2011)
• Purchase and Sale Agreement - Amoco D.T. Co., Amoco X.T. Co, Amoco Y.T. Co, SWEPI LP, Shell Land & Energy Co, Shell Onshore Ventures Inc., Shell K2 Inc., Shell Everest Inc. and Occidental Petroleum Corp. (Mar 06, 2000)
• Underwriting Agreement - Occidental Petroleum Corp. (Aug 15, 2011)

Titan Exploration Inc.

• Agreement and Plan of Merger - Union Oil Co. of California and Titan Exploration Inc. (Dec 12, 1999)
• Business Opportunities Agreement - Union Oil Co. of California and Titan Exploration Inc. (Dec 12, 1999)

Unocal Corp.

• Change in Control Agreement - Unocal Corp. and Timothy H. Ling (Jul 27, 1998)
• Consulting and Settlement Agreement - Unocal Corp. and Roger C. Beach (Feb 28, 2001)

Vastar Resources Inc.

• Formation Agreement - SEI Holdings Inc. and Vastar Resources Inc. (Aug 07, 1997)