A
Abraxas Petroleum
Adkins, RL
Alleder
Allegro Operating
Altura Energy, Ltd
Amerada Hass
American Gas Storage
Amoco Production
Amtex Energy
Anadarko Petroleum
AOCO
Apache Corporation
Arcadia Exploration & Production
Arch Petroleum
Aspen Energy
ATAPCO
Austex Petroleum Corp.
Autry Stephens, Inc.
B
B & F Well Service
BEC
Bechtel Petroleum Operations
Bee-Jay Energy
BP Alaska
BP Amoco (Chaco)
Brigham Oil & Gas
Brown, SA
Bruce Willbanks
Burlington Resources
Byrd Operating

C
Campbell & Hedrick
Caprock Operating
CCF Inc.
Celsius Energy
Central Resources
Charter Petroleum
Chevron USA
Chl Energy
Citation Oil & Gas
Cliffwood Oil & Gas
Coastal Oil & Gas
Coda Energy
Collins & Ware
Conoco
Costilla Petroleum
Cottonwood, Inc.
Covenant
Crawley Petroleum
Crosstimbers Operating

D
Dakota Resources
Davis Asset Management
Diamond M Operating
Dorman Anderson
Double Eagle Oil
Dowell Schlumberger
Dreher, George
Dyad Petroleum

E
Eastland Oil Company
Edwards-Foster
Energy Production
Enrich Oil
Enron
EOG Resources, Inc.
Exxon
ExxonMobil

F
Federal Oil & Gas
Fina
First Permian LLC

G
Greenhill Petroleum
Gruy Petroleum
Gus Edwards Co.

H
Haliburton Energy Services
Hallwood Energy
Heartland Petroleum
Henry Petroleum
Heyco
Houston Exploration
Hydrocarbon Management
Hyperion Resources

I
Ibex Resources LLC
Imperial Gas Resources
Intercoastal Oil & Gas

J
Jordan Engineering
J-W Operating

K
K. Stewart Oil Co.
Kerr McGee/Oryx
Kerry Petroleum
Kimbell Oil Co.

L
Lanexco
LB Simmons
Lindenmuth & Associates
Lynx

M
Maersk Energy
Maersk Oil OG Gas
Marathon
Marcum Drilling
McBee Energy
McCann Oil
MDC Operating
Merit Energy
Micky Neff Oil Co.
Midland Energy
Midland Resources
Miltex Oil Company
Minera Escondida
Mitchell Energy Corp.
Mobil Oil
Momentum Operating
Morris Greehshaw

N
North Operating

O
Omar Operating
Orla Petco
Oryx
OXY Permian Ltd.
OXY USA

P
Palmer Oil Co.
Parker & Parsley
Patterson Petroleum
Patton Exploration
PDVSA
PEMEX
Pennzoil
Permok
Petro Gulf Corp.
Petroplex Engergy
Phillips Petroleum
Phoenix Petro Corp.
Pittencrieff American
Polk Petroleum
Prasad, Henri
Prime Operating
Primero

Q
Quality Petroleum

R
R. Lacy
Redman Operating
Rhombus Operating
Ricks Exploration
Ricks Welding
Rim Operating
Rio Petroleum
Robert H. Forrest
Royalty Land & Development

S
Samson Operating
Sanchez Oil & Gas
Sandia Production Co.
Satanta Oil Company
Seaboard Oil
Shell
Signal Hill Petroleum
Sledge Brothers Oil Company
Socorro Operating
Sojourner Drilling
Sonat
Southwest Energy Production
Southwest Royalty
Strata Production Co.
Sundial Resources
Sullivan, HR

T
Tamarack Petroleum Co.
Tejones Operating
Tesoro E & P
Texaco E & P
Texland Petroleum
Thums Long Beach
Tipperary Oil & Gas
Tom Brown, Inc.
Torch Energy

U
UMC Petroleum
Union Pacific Resources
Union Royalty
Universal Resources Corp.
Unocal
US Oil & Gas

V
Valence Operating
Vector Exploration
Vista Resources

W
W & W Properties
Walsh Engineering
Walsh & Watts
Weatherford Completion Systems
WEPCO Energy LLC
Westar Energy
Western Gas Reerves
Wheeler Properties
Williams Oil Co.
Wiser Oil Co.

XYZ
Xeric Oil & Gas
Yates Energy
Yucca E