ADOBE OIL & GAS; COLORADO SPRINGS, COLORADO 80909; 719-592-0855

ALPINE OIL & GAS; DURANGO, COLORADO 81301; 970-247-5386

AMALGAMATED PETROLEUM CO; DENVER, COLORADO 80202; 303-629-5115

AMOCO PRODUCTION CO; SOMERSET, COLORADO 81434; 970-929-6881

ANSCHUTZ CORP; DENVER, COLORADO 80202; 303-298-1000

ATLANTIC OIL CORP; DENVER, COLORADO 80202; 303-295-0050

AVIVA INC; DENVER, COLORADO 80246; 303-321-0606

BARWIN JOHN R; DENVER, COLORADO 80228; 303-984-1964

BASIC EARTH SCIENCE SYSTS INC; DENVER, COLORADO 80202; 303-296-3076

BENCHMARK OIL & GAS; DENVER, COLORADO 80202; 303-595-9251

BOARDMAN ALEXANDER C; DENVER, COLORADO 80202; 303-825-4141

BROOKS EXPLORATION INC; DENVER, COLORADO 80202; 303-629-2433

BUCY M PEYTON; DENVER, COLORADO 80203; 303-861-4292

CASCADE OIL & GAS INC; BROOMFIELD, COLORADO 80038; 303-469-6914

CAULKINS OIL CO; DENVER, COLORADO 80202; 303-861-4230

CHARLIE KILO RESOURCES INC; DURANGO, COLORADO 81303; 970-259-4447

CHEMCO INC; CASTLE ROCK, COLORADO 80104; 303-771-7777

COLORADO WYOMING RESERVE CO; GRAND JUNCTION, COLORADO 81506; 970-241-5799

COLTON & COLTON; DENVER, COLORADO 80293; 303-298-1567

CONNELLY EXPLORATION INC; DENVER, COLORADO 80202; 303-296-0280

D & D RESOURCES INC; RANGELY, COLORADO 81648; 970-675-8061

D & G ROUSTABOUT SERVICE; FRUITA, COLORADO 81521; 970-858-1581

DAVIS PETROLEUM CORP; DENVER, COLORADO 80202; 303-623-1000

DUNCAN ENERGY; FORT MORGAN, COLORADO 80701; 970-867-2431

EVERTSON OIL CO; DENVER, COLORADO 80202; 303-595-9478

FAIRWAY RESOURCES INC; DENVER, COLORADO 80202; 303-293-2233

FEDCO MANAGEMENT CO; DENVER, COLORADO 80206; 303-377-9577

FRITZLER RESOURCES INC; FORT MORGAN, COLORADO 80701; 970-867-9388

GETTY REFINING & MARKETING CO; DENVER, COLORADO 80216; 303-458-8774

GIBSON J W; HENDERSON, COLORADO 80640; 303-289-2966

GOLDBLATT ARNOLD L; DENVER, COLORADO 80202; 303-825-4533

GROGAN DOYLE T; DENVER, COLORADO 80202; 303-573-1068

HALLADOR PETROLEUM CO; DENVER, COLORADO 80264; 303-839-5504

HALLWOOD PETROLEUM INC; DURANGO, COLORADO 81303; 970-259-1374

HALLWOOD PETROLEUM INC; FRUITA, COLORADO 81521; 970-858-1107

HATHAWAY OPERATORS; MARVEL, COLORADO 81329; 970-588-3302

HEWIT FAMILY PARTNERSHIP; DENVER, COLORADO 80293; 303-292-0697

INDIAN CREEK RESOURCES INC; BERTHOUD, COLORADO 80513; 970-532-0430

INLAND PRODUCTION CO; DENVER, COLORADO 80202; 303-893-0102

INTERNATIONAL DEVELOPMENT ENT; LAKEWOOD, COLORADO 80215; 303-232-4336

JENEX PETROLEUM CORP; DENVER, COLORADO 80293; 303-383-1515

JEROME P MC HUGH & ASSOC; DENVER, COLORADO 80246; 303-321-2111

JERRY RYAN & CO; DENVER, COLORADO 80202; 303-623-4472

KEY PRODUCTION CO INC; DENVER, COLORADO 80202; 303-295-3995

KINDER MORGAN CO2 CO; CORTEZ, COLORADO 81321; 970-882-2464

LEEMAR; DENVER, COLORADO 80202; 303-893-3527

LOMBARDI & BANTA; DENVER, COLORADO 80237; 720-493-5491

LUFF EXPLORATION; DENVER, COLORADO 80203; 303-861-2468

MAGPIE OPERATING INC; LITTLETON, COLORADO 80127; 303-978-1147

MARKS OIL; DENVER, COLORADO 80203; 303-861-1974

MC RAE & HENRY; DENVER, COLORADO 80202; 303-623-5999

MENDELL-PETROLEUM CORP; CASTLE ROCK, COLORADO 80104; 303-663-2902

MERIT ENERGY CO; ANTON, COLORADO 80801; 970-383-2299

MOBIL OIL CORP; CORTEZ, COLORADO 81321; 970-564-5200

MOBIL OIL CORP; RIFLE, COLORADO 81650; 970-878-5791

MORGAN ENERGY; DENVER, COLORADO 80202; 303-296-9270

MULL DRILLING CO; CHEYENNE WELLS, COLORADO 80810; 719-767-8998

MULL DRILLING CO; KIT CARSON, COLORADO 80825; 719-962-3407

NATIONAL FUEL CORP; FRUITA, COLORADO 81521; 970-858-7490

NORTH AMERICAN RESOURCES INC; BRIGHTON, COLORADO 80603; 303-659-7443

OBERING WILLIAM M; ENGLEWOOD, COLORADO 80111; 303-863-0400

ODUM OIL & GAS; BOULDER, COLORADO 80303; 303-499-7626

O'HARA E B; DENVER, COLORADO 80202; 303-595-9544

OIL FIELD SALVAGE & SERVICE CO; ENGLEWOOD, COLORADO 80110; 303-762-6419

OMIMEX PETROLEUM INC; AURORA, COLORADO 80015; 303-617-4540

PAR OIL CO; DENVER, COLORADO 80202; 303-825-4358

PETROLEUM SYNERGY GROUP INC; DENVER, COLORADO 80202; 303-292-9002

PETRON DEVELOPMENT CO; LITTLETON, COLORADO 80120; 303-794-5300

PHILIP T SHARPLES TRUST; DENVER, COLORADO 80264; 303-861-1800

PINNACLE PRODUCING PROPERTIES; DURANGO, COLORADO 81301; 970-382-0670

Q-PETROLEUM; DENVER, COLORADO 80206; 303-331-0808

RANCH OIL CO; GREENWOOD VLG, COLORADO 80111; 303-771-2343

REMORA OIL CO; DENVER, COLORADO 80222; 303-758-4489

REX MONAHAN OIL PROD; STERLING, COLORADO 80751; 970-522-0774

RGB CO; DENVER, COLORADO 80237; 303-221-9025

RIO CHAMA PETROLEUM INC; PAGOSA SPRINGS, COLORADO 81147; 970-264-0170

ROBERT HAWKINS INC; GRAND JUNCTION, COLORADO 81505; 970-243-1154

SANDLIN OIL CORP; DENVER, COLORADO 80293; 303-292-3313

SCHULEIN CO; DENVER, COLORADO 80203; 303-839-5495

SMITH ENERGY CORP; GREELEY, COLORADO 80634; 970-330-7034

STELBAR PRODUCTION CO; AULT, COLORADO 80610; 970-834-2812

STERLING PETROLEUM PRODUCTS; DENVER, COLORADO 80202; 303-244-1775

TEXACO INC; DENVER, COLORADO 80237; 303-793-4000

TEXACO INC; MEEKER, COLORADO 81641; 970-824-6452

TRIPLE R OIL CO; STERLING, COLORADO 80751; 970-526-0257

U S OIL & GAS INC; CORTEZ, COLORADO 81321; 970-565-0793

UNION PACIFIC RESOURCES CO; CHEYENNE WELLS, COLORADO 80810; 719-767-8851

VAN METER JR BAYLOR; DENVER, COLORADO 80202; 303-861-7114

VECO DRILLING INC; GRAND JUNCTION, COLORADO 81505; 970-245-9550

VIS-OP OIL; STERLING, COLORADO 80751; 970-522-1832

WALKER DONALD S; LITTLETON, COLORADO 80120; 303-794-5300

WALSH PRODUCTION INC; STERLING, COLORADO 80751; 970-522-1839

WESTERN OPERATING CO; BRANDON, COLORADO 81071; 719-729-3391

WHITING PETROLEUM CORP; DENVER, COLORADO 80290; 303-837-1661

WHITING PETROLEUM CORP; FORT COLLINS, COLORADO 80524; 970-493-3453

WILLIAM GRUENERWALD & ASSOC; COLORADO SPRINGS, COLORADO 80906; 719-579-0707

WILLIFORD ENERGY CO; KIT CARSON, COLORADO 80825; 719-962-3451

WILLIFORD ENERGY CO; MARVEL, COLORADO 81329; 970-588-3701

XOIL INC; AURORA, COLORADO 80014; 303-751-4739