A&T Exploration
AmBrit Energy
Amoco Production
Ashland Exploration
Aspen Energy
ATAPCO
Browning Oil
Bureau of Economic Geology
Burlington Resources
CWF Energy
Cabot Oil
Charter Crude Oil
Chase Petroleum
Chevron
Clajon Gas Company
Cockrell Oil
Coho Energy
Comstock Resources
Dale Resources
Dames & Moore
Deepstar Consortium
Denbury Resources
Devon Energy
Edisto Resources
Enron
Enserch
Falcon Seaboard
Forest Oil
Freeport McMoRan
Gas Research Institute
General Atlantic
Global Exploration
Greenhill Petroleum
Heritage Resources
JLA Resources
Kerr-McGee
Koch Exploration
Lomak Petroleum
MAPCO Marathon Oil
Meridian Oil

Minerals Management Service
MIT Mobil Oil
Murphy Oil USA
Nacona Minerals
NERCO Oil and Gas
NGC Energy
Oxy USA
Oryx Energy
PG & E Resources
Pacific Enterprises
Peko Oil USA
Pennzoil
Penrod Drilling
Petroglyph Gas Partners
Petroleum Information Corporation
Placid Oil
Ramco Oil & Gas
Rio Petroleum
Rising Star Energy
Santa Fe Energy
Seagull Energy
Shell
Stellar Gas
Sun Exploration & Production
Sundance Resources
Taylor Energy
Texaco
TransTexas Gas
Transco Exploration & Production
Triton Oil and Gas
Trophy Harvest Oil
Ultramar Oil and Gas Limited
Union Pacific
UNOCAL
U.S. Department of Energy
Valero Transmission
Vaughn Petroleum
Vintage Petroleum
Western Company of North America
Yates Petroleum

Agip (UK)
Argosy Energy International
Asamera
Asociación de Industrias de Hidrocarburos del Ecuador (AIEH)
AUSPET
Aviva Petroleum
Azul
Beach Petroleum
BP Development
British Gas
British Borneo
Cámara de Comercio de Quito (CCQ)
Canadian Newscope Petroleum
Canterra Resources
Carless Exploration
Carnarvon Petroleum
Caspian Energy Central Asia Petroleum
Cayman
CEPSA
Churchill Corporation
Comada Oil and Gas
Delta Oil
Ecopetrol
Ecuador TLC
ENAP Sipetrol
Encana
Energy Equity Corp.
Field Petroleum
Fletcher Challenge Petroleum
Garnet Resources
Government of Republic of Honduras
Hampton Gold IFP
Hocol Nimir

Hydrocarbon Industry Association of Ecuador
Instituto Argentino del Petróleo y del Gas (IAPG)
IOR Exploration JNOC
LASMO
Mannai Quest
Maraven Medco Energi
Neste Oy
Norsk Hydro
Nycal
Odyssey Petroleum Cyprus
OGM Development
Oryx UK Energy
Ottawa Energy
PanCanadian
PDVSA
PEMEX
Petrobras
Petrotesting
Qatar Petroleum
Repsol Exploration
Sipetrol
SK Corporation
SANTOS
Sun Oil Britain
Trinidad & Tobago Oil
Triton Energy
Tropical Oil
United Nations
WESMINCO
Wintershall Noordzee
Woodside Petroleum
YPFB

Canada Trust
Chemical Bank
Coopers & Lybrand
County Natwest Securities Australia
Dean Witter Reynolds
Deloitte Haskins & Sells
EnCap
First Boston
Goldman Sachs & Co.
Heller Financial
Irving Trust Company
James Capel
J.P. Morgan
Kemper Securities
Lloyds Bank
Manufacturers Hanover
Mellon Bank

Midland Montagu
Morgan Guarantee Trust
NationsBank
Newbridge Capital
Newbury, Piret & Company
PaineWebber
Premier Capital
Prudential-Bache
Raucher Pierce Refsnes
Reid Investments
Rothschild Australia
Royal Bank of Scotland
Southwest Securities
State Street Bank and Trust
Sumitomo Bank
Texas Commerce Bank
The World Bank

Bright, Nichols, Zrenda & Dunn
Freehill Hollingdale & Page
Gardere & Wynne
Gibson, Dunn & Crutcher
Haynes and Boone

Liddel, Sapp and Zivley
Piper Alderman
Stephen F. Malouf
Thompson & Knight
U.S. Department of Justice