A 

A.B. Energy
A.D.A. Exploration
A.S.C. Consultants, Inc.
Alpine, Inc.
American Petrofina
Ameriech Oil and Gas
Amot Operating
Andrews, Randy
Aratex Production Company
Ashby Stripping Company
Austin Oil & Mineral

B

 
B.R.T. Venture
Bair, W.B., Oil Company
Bair-Lee Oil Company, Inc.
Balcron Oil Company
Barbee & Company, Inc.
Barrett, Arnold & Olga Oil
Baynon Oil Exploration Company
Bennett Resources
Bentley Oil & Gas
Benton Energy
Berry, Gus
Beta Tex., an Oklahoma Corporation
Bettis, Boyle & Stovall
Bevin Oil Company
Bint, Lynn
Birdwell Oil Company
Boyd, Clyde, Oil & Gas
Boyd, D.K., Oil Gas Company
Breck Operating, Inc.
Bristol Resources
Britnic Oil & Gas
Bufton Oil and Gas
Burk Royalty Company
Burns, P.C., Oil Company
Byrd Operating Company

C

 
C.D. Consulting & Operating Company
C.R.W. Oil Company
Carter, W.F.
Casteel, F. Hoyt
Cenex, Inc.
Centaur Petroleum Corporation
Central Texas Oil & Gas
Centurian Operating, Inc.
Chapman Exploration, Inc.
Chesapeake Operating, Inc.
Chevron USA, Inc.
Circle 7 Production
Circle R Drilling
Clayton Williams Energy
Clear Fork Energy Res, Inc.
Coalinga Oil Corporation
Coastal Plains Energy, Inc.
Cobra Oil Corporation
Collier Operating Company
Cone, Charles M., Associates
Connemera Drilling, Inc.
ConocoPhillips 
Conservative Oil & Gas
Consolidated Energy
Continental Export Corporation
Cooke Oil Company
Corda Corporation
Cornell Oil Company
Cornett Oil Company
Corpining Enterprises
Cougar Energy, Corporation
Crego Exploration
Crown Exploration

D

D & J Resources
D.E. Energy Company
D.W.W. Cattle & Oil Company
Dadson Oil Company, Inc.
Dallas Production, Inc.
Davis Petroleum Company
Day, James
Dean Drilling Company
Dearing, Inc.
DeCleva, Paul
Dee-Jan Oil Company
DeLong, Lawrence & Associates
Delta Hydrocarbons, Inc.
Denton, Exploration, Inc.
Derby Oil of Texas
Desana Oil Corporation
Dimock Petroleum
Discover Exploration
Discover Oil Company
Dodson Oil Company Inc.
Domestic Crude
Dymanic Production

E

E & G Operating, Company
E.P. Operating, Inc.
Echo Production Company
Eldorado Oil & Gas, Inc.
Elenburg Production Company
Ely, John
Emerald Petroleum Company
Encore Energy, Inc.
Energy Investment Group, Inc.
Enexco USA, LTD
Engas Corporation
Enrich Oil Corporation
Ensearch Exploration
Enterprise Energy
Erwin Energy
Estec Operating Company
Evans, Mike, Oil & Gas Company
Exorare Energy, Inc.
Expro Engineering

F

 
Fagadaw Energy Corporation
Felderhoff Production
Fina Oil and Chemical
Fortson Oil Company
Fossil Bay Petroleum
Franklin, Hal, Operating
Frontier Exploration Company

G

G.B.G. Operating Company
Gallagher, C.R.
Glenn Supply Company
Grand Drilling Company
Grand Energy
Great West Energy, Inc.
Gruy Management
Guinn Investments
Gunn Oil Company

H

H & S Production
H.H. & W. Oil Company
Hale Oil & Gas Properties
Hall Operating Company
Harding Oil Company
Hawkins, G.A.
Heighten, Stewart
Hockley County Resource
Hulsey, Larry, Company
Hulsey-Ingram Oil Company
Hutchco Production

I

I.G. Oil Company
Ibex Petroleum
Inca Energy
Indian Oil Company
Inland Exploration
Investek, Inc.

J

J.G. Stone
J.G. Stone Oil Company
J.W. Oil Company
Jackson Drilling
Jaron Exploration
Jerry Hess Operating
Johnson, Axel, Exploration & Production
Johnson, M.R.
Jones, Vern, Oil & Gas

K

K.C. Resources, Inc.
Kadane Oil Company
Kasle Energy, Inc.
Kendrick Oil
Kimbell Oil
King Operating Corporation
Kinlaw Oil Corporation 
Kocana Resources
Kramer, Frank
Kwan-Mor Exploration

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L

L & J Oil Company
Lambada Operating Company
Lankford, Dan, Oil Company
Larance Engineering
Liberty Oil & Gas
London & Waggoner
Lone Star Gas Company
Longhorn Exploration
Longhorn Resource, Inc
Lucky Oil & Gas Company
Lyndum, Inc.
Lynx Oil Company

M

Multiplex Energy
M.D.F.
Macron Operating
Marbil Oil, Inc.
Marlin Oil Company
McBay Drilling
McCrea Exploration
McMahon-Bullington Oil Company
Medders Oil Company
Miami Oil Producers
Mid-West Oil Company
Miles Production
Mineral Development
Misahar Investments
Mitchell Energy Company
Mogul Petroleum
Montauk Exploration, Inc.
Moore Oil Company
Mountain Creek Oil Company
Murfin Drilling
Murphy, James, Jr., Inc
Myers, Pat

N

N.Q.R. Petroleum
National Co-Op Refinery
Newport Petroleum
Nichols, Edwin S.
Noble Energy
Nordan Oil & Gas
Norfolk
North Texas Energy
Northern Michigan Exploration
Nunley, T.J. & Company

O

Oryx Energy Company
Oxford Equity
Oxy USA, Inc.
Ozark Exploration, Inc.

P

P.C. Burns
P.E.D. Corporation
Patterson Petroleum
Payne Operating
Pennzoil Oil Company
PetroCorp, Inc.
Pevey, T.M.
Phillips Petroleum
Phillips, M.J.
Pickens Company, Inc.
Pico Drilling
Producers Operating Company
Providence Energy
Pryor Petroleum Corporation
Publishers Petroleum

Q

Quinoco Petroleum, Inc.

R

Railhead Energy Company
Rand Paulson
Ranger Operating Company
Rathland Resources, Inc.
Rico Oil Company
Ridley, Bishop & Morris Oil
Rippy Oil Company
Roach, R. Byron, Trustee
Robertson Oil & Gas
Roca Resources Company, Inc.
Rosewood Resources
Royal Petroleum
Rush, C.R.

S

S & J Operating
S.K.I. LTD
Sabre Exploration
Sauder Management
Scan Gas, Inc.
Scandrill Company
Segudo Oil & Gas
Seisma Corporation
Shane Oil Company
Shar Alan Oil Company
Sharp Image Energy
Shillelagh Oil Company
Shoshone Oil Company
Singer Oil Company
Skidmore Exploration
Smith International
South Texas Drilling & Exploration
Southeastern Resources
Southern Alliance Oil Corporation
Southern Transmission Gas Company
Spence Energy Company
Springfield Oil Services
Stamper, Steve
Star Energy
Star of Texas Energy Services
Steed Oil & Gas
Stephens & Johnson
Stephenville Operating Company
Stivers, Inc.
Strategic Petroleum
Sullivian, Hollis R.
Sulpher River Exploration
Sun Dance Exploration
Sun Exploration & Production
Sunset Energy of Texas, Inc.
Syndicated Petroleum

T

T.D.C. Engineering, Inc.
T.R.M. Petroleum
T.X.O. Oil Company
T.X.P. Oil Company
Talon Production
Tarra Resources
Taubert, Steed, Gunn & Meddars
Tenison Oil Company
Terra Resource, Inc.
Texas Drilling Company
Texas Nevada Oil & Gas
Texas United Geoproduction, Inc
Texas United Oil & Gas Company
Three Brothers
Threshold Energy
Tierra Energy, Inc.
Todd & Sanders, Inc.
Tooke Engineering
Tracer Energy
Trio Operating
Trio Operating Company
Twin Mountain

U

Ultra Oil & Gas Inc.
Union Pacific Resources
Upham Oil & Gas

V

 
Veale Lan and Cattle Company
Vicars Oil & Gas Corporation

W

Walter Exploration Inc.
Warner Drilling
Welk Resources
West Oil Company
West Ridge Oil & Gas Corporation
Western Chief
Westport Oil & Gas
Westwood Energy
Wichita Falls Oil Exp Company
Widner Oil Company
Wiser Oil Company
Wolsey Oil Company
World Oil Corporation
Wylie Oil Drilling

Y

Yates Energy Corporation