Burlington Resources - Houston, TX
Capital Partners Inc. - El Paso, TX
Cimarex Energy Co. - Tulsa, OK
Conoco-Phillips - Houston, TX
Columbia River Resources - Wichita Falls, TX
Constellation Energy - Houston, TX
Daystar Oil & Gas - Austin, TX
Devon Energy - Houston, TX
Diker Management - NY
Far East Energy - Houston, TX
Firevine Royalties - Dallas, TX
Geopark Exploration - Houston, TX / Buenos Aires
Geoplus Corporation - Tulsa, OK
Great Plains Energy - Kansas City, KS
Hall Geological Services - Tulsa, OK
Helmerich & Payne - Tulsa, OK
Jefferson Wells - Houston, TX
Kansas Power & Light - Kansas City, KS
Key Production Co. - Denver, CO
KLT Gas - The Woodlands, TX
Krescent Energy - Houston, TX
Lamar Oil & Gas - Corpus Christi, TX
Laramie Energy - Denver, CO
Lindon Exploration - The Woodlands, TX
Merrill Lynch/Petrie Parkman - Houston, TX
Morgan Stanley - NY
Particle Drilling - Houston, TX
Petrie Parkman - Houston, TX
Petroleos de Venezuela - SA (PDVSA)
Petroleos Mexicanos - Mexico (PEMEX)
Pertimina - Indonesia
Potter Oil Co - Kingfisher, OK
Rike Services - New Orleans, LA
Subsurface Consultants Inc - Houston, TX
TotalFina - Balikpapan, Indonesia
US Commerce Department - Washington DC
Westex Energy - Wichita Falls, TX
YUKOS, Slavneft, & Tyumen Oil Company (TNK) - Russia