Ely and Associates, Inc.

Oil Companies

Abraxas Petroleum Corp
Acock/Anaqua Operating Company
Advanced Resources Intl
AEC Oil & Gas
Aexco
AGIP
Agio Oil & Gas Corporation
Al Furat Petroleum Company
Allegro Investments, Inc.
Altura
American Exploration
Americo Energy
Amoco
Anadarko Petroleum Corporation
Antara Resources Inc
Apache Corporation
Araxas Energy
Aquila Energy Resources
Arco
ATP Oil & Gas
Atropos Production Co
Avalon Energy Corporation
Avalon Oil Company
Aviara Energy Corp.
B & W Exploration
Baker Energy
Baker Oil Tools
Barnwell of Canada
Basal Corporation
Bass Enterprises
BC Operating
BK Energy Corporation
BP America, Inc.
Barrett Resources
Basal Corporation
Basin Exploration Inc
Bass Enterprises
Beartooth
Benchmark Research & Technology
Bettis Boyle & Stovall
Bettis Brothers Inc
Blue Ridge Group
Bolding Chemical, Inc
Bonneville Fuels Corporation
Bridge Oil Company
Brigham Oil & Gas
British-Borneo Exp Inc
Browning Oil Company
Burlington Oil & Gas
CWF Energy, Inc
C.W. Trainer
Calpine Natural Gas Company
Calvin Resources, Inc
Cane River Resources
Capataz Operating
Carbo Ceramics
Carbon Energy Corp
Carrizo Oil & Gas
Carson Energy Corporation
Cawley, Gillespie & Associates
Chaparral Energy
Chemical Blending Services
Chesapeake Energy Corp.
Chevron USA Production
Cimarron Energy
Citation Oil & Gas Corporation
Clayton Williams Energy, Inc.
CNG Producing Company
Coastal Consulting
Coastal International
Coastal Oil & Gas Corp
Cobb & Associates
Cobra Oil & Gas
CoHo Resources
Collins & Ware Inc
Conoco Inc
Conquest Oil
Cox & Perkins Exploration
Crest Resources
Cursader Energy Corp.
Cypress E & P Corp
Dale Operating
Dallas Production Inc
Davis Brothers Oil Producers
Davis Petroleum Corporation
Devon Energy Corporation
Dev X Energy
Domain Energy Corp
Dominion Energy & Production
Drum Energy
DSTJ
Dyne Exploration Co
Dyna Coil
ECA Holdings, LP
Edge Petroleum Corporation
EEX Corporation
El Paso
Energy Corporation of America
Energy Development Corporation
ENI Petroleum

Enron Oil & Gas
Enserch Oil & Gas
Ensign Oil & Gas
EOG
ERCO
Essenjay Petroleum Corp
ETOCO
Evergreen Operation
Exco Resources Inc
Exeter Energy Services L.L.C.
Extex Production Inc
Exxon Company USA
Fairway Minerals Corp
Falcon Seaboard Resources
Fancher Oil LLC
Fina Oil & Chemical
First Sourcenergy Group
Forcenergy
Forest Oil Corporation
Fortson Oil Company
FW Oil Interests
Gas Research Institute
Gas Technology Institute
Genesis Producing
Geomet Inc
Grace Oil Company
Great Western
Greenwood Holdings, Inc
HS Resources Institute
Hanagan Petroleum Corp
Hardy Oil & Gas
Harrison Interest
Headington Oil Company
Henderson Petroleum Corp.
Heritage Energy Company
Heritage Resources
Houston Exploration Company
Hunt Oil Company
Hydrocarbon Operating
Integrated Petroleum Resources
IP Petroleum
John Wright Company
Johns Energy LLC
Jorford Corporation
J & W Engineering
JMA Resources Inc
J.M. Huber Corporation
Kan Map Inc
KCS Medallion
KCS Resources
Kelly Oil & Gas
Kerr McGee Corporation
Kinder Morgan
King Ranch Oil & Gas
Kytex Inc
Laguna Oil & Gas
Langham Petroleum
Legend Natural Gas, LP
Lightning Oil Company
Loudon Exploration, Inc
Louis Dreyfus Natural Gas
Lundberg Operating Company, Inc
Lynx Energy Company
Maersk Oil & Gas
Magnum Producing & Operating Co.
Mainland Energy Corp
Marathon Oil Company
Marshall & Winston
Marquez Energy, LLC
McKay Oil Corp
McKenzie Methane
MexPetrol
Meridian Oil
MGC Resources
Midcon Gas Services
Midland Resources Inc
Millennium Offshore Group
Miller Energy
Miller Exploration Company
Milo Petroleum Company
MIM Holdings Ld
Mission Resources
Mitchell Energy
Mobil E&P US
Mustang Fuel Corp
Natchez Production, Inc.
National Energy Group
Natural Gas Pipeline Co. of America
Nearburg Producing Company
Neuman Production
Newfield Exploration Co
Newfield Exploration Mid-Cont. Inc.
NExt
Norcen Explorer, Inc
North Central Oil Corp
Norton Company
Ocean Energy
Odegard Energy
Odyssey Petroleum
Oklahoma RB Operating

O'Ryan Oil & Gas
Output Exploration
Oxy USA, Inc
P & A Operation Inc
Parker & Parsley
Parsec Resources
Pearl Energy
Peoples Energy
Pennzoil
Penwell Energy Inc
Petroleum Research & Consulting Serv
PetroMax
Petrotex Inc
Petsec Resources Inc
Phillips Petroleum Company
Pinnacle
PITCO
Pogo Producing Company
Prime Operating Company
Protechnics
Pure Resources
Questar Exploration & Production
Ramey Petroleum Consultant
Read & Stevens
Reef Exploration
Reliance Operating Co
Repsol
Reserve Operating Corp
Restech Houston Inc
Rhombus Energy
Riata Energy
Ricks Exploration, Inc
Ridgeway Arizona Oil Corp
Rimco
Rio Bravo
Rio Petroleum
River Producing Company
Rocky Mountain Consulting
Rutherford Oil Corporation
Sabco Oil & Gas
Samson Canada Ltd
Samson Resources
Santa Fe Energy
Santrol
Scana Petroleum
Schoch & Company
Seneca Resources
Shana Petroleum Company
Shell Oil Company
Shell Western E&P, Inc
Sierra Resources, LLC
SND Energy Company
Snyder Oil Company
Southwest Resources
Spirit Energy
Star Resources
Stim Lab
Stinger
Strata Production
Stream Energy
Strickland Engineering
Sue-Ann Operating
Suemaur Exploration
Tarpon Operating & Dev, LLC
TDC Energy
Tetra Technologies
Texaco
Texas Independent Exploration
Texland Petroleum, Inc
The Redmon Oil Company, Inc.
The Wiser Oil Company
Timber Sharp Drilling
Tom Brown
Total Minatome
Traton Engineering
Tres Management
Treybig Enterprises Inc
Triad Energy Corp
Tri-C Resources
Twister Gas Services
Union Gas Operating
Union Texas Petroleum
Unit Petroleum Company
Unocal
Ventex Oil & Gas, Inc.
Verdad Oil & Gas Corporation
Vessels Oil & Gas Company
V-F Petroleum
Warren Corporation
W. B. Osborn Oil & Gas Operations
Westech Energy Corporation
Whitting Petroleum Corp.
William M. Null Oil Producers
Williams Oil Company
Wiser Oil Company
Wynn Crosby Energy
Yates Petroleum
Yucca Energy, Inc
Zilkha Energy Company

Service Companies

BJ Services
Cudd Pumping Service
Dowell Schlumberger

Halliburton Energy Services
International Nowsco Services

Nowsco Well Service
Weatherford International Ltd.

Law Firms

Andrews & Kurth, LLP
Arnold, White & Durkee
Caperton, Rogers & Miller
Baker Botts, LLP
Baker & Hostetler
Beirne, Maynard & Parsons, LLP
Bettis, Boyle and Stovall
Brown, Simms, Wise & White
Caperton, Robers & Miller
Cotton, Bledsoe, Tighe & Dawson

Cook, Yancey, King & Galloway
Downer, Kyle & Willhite
Elkins & Yount
Fultz & Davis
Griggs & Harrison
Goforth & Lewis
Hargis & Harpold
Heidelberg & Woodliff
Leslie G. MacLaughlin, Attorney
Loyd Bolding, Attorney

McGuire Woods, LLP
Meyers & Associates, Inc
Oldham & Associates
Rathwell & Nizialek, PC
Rosenblatt & Associates
Sacks & Associates
Shannon, Gracey, Ratliff & Miller, LLP
Stokes & Spiehler
Woodard, Hall & Primm
W.F. Palmer