Acquired by Flowserve Corp

Acquired assets of Continental Trend Resources Inc, affiliates J. S. Aviation and Wheatland Oil Company in January 1987, and changed name to Continental Trend Resources Inc.

Acquired by NAL Oil & Gas Trust in December 2009.

Acquired by Twin Butte Energy Ltd. in October 2009.

Acquired by Eagle Rock Energy Partners LP in April 2008.

Acquired by Chesapeake Energy Corporation in 2004.

Operating subsidiary of Stanolind Oil & Gas LP.

Acquired by Penn Virginia Corporation in July 2001 for $112 million.

Changed name to Legacy Oil+Gas Inc in November 2009.

Currently in receivership after judgment of committing fraud & violating Kentucky Securities Act in August 2009.

Name changed to Jack Everett LLC in 2005.

Filed for Chapter 11 bankruptcy before May 2008.

Morris Energy Group LLC acquired remaining 50% interest in July 2008 after acquiring initial 50% interest in January 2008.

Acquired by Morris Energy Group LLC in July 2005.

Assets acquired by Petrobras and Perez Companc in December 1999, see Petrobras Bolivia Refinacion SA.

100% ownership of assets acquired by Yacimientos Petroliferos Fiscales Bolivianos (YPFB) in June 2007 after YPFB acquired initial 51% ownership in May 2006.

Dba Apco Argentina Inc.

Name changed to Beryl Oil and Gas LP in May 2007.

Acquired by Dynamic Offshore Resources LLC in October 2009. See Dynamic Offshore Resources LLC.

Acquired by Duke Energy Corp in September 2008; see Duke Energy Generation Services.

E&P operating subsidiary of Reliance Industries Ltd.

Operating subsidiary of Baker Exploration Co - BEXCO.

Acquired by Stone Energy Corporation in August 2008.

Changed name to ShaMaran Petroleum Corporation in October 2009.