AMWEST PETROLEUM; UPTON, WYOMING 82730; 307-468-9238ANDERSON MANAGEMENT CO; GILLETTE, WYOMING 82716; 307-682-6049ARNELL OIL CO; CASPER, WYOMING 82604; 307-472-7409BALLARD PETROLEUM; GILLETTE, WYOMING 82716; 307-685-0217BERCO RESOURCES; ROCK SPRINGS, WYOMING 82901; 303-825-1188BIG BASIN PETROLEUM; GILLETTE, WYOMING 82718; 307-687-0406BLACK HILLS EXPLORATION & PROD; NEWCASTLE, WYOMING 82701; 307-746-3517BRECK OPER CORP; ROZET, WYOMING 82727; 307-686-8299CAMWEST; RIVERTON, WYOMING 82501; 307-856-8135CARL D UNDERWOOD OIL & GAS; CASPER, WYOMING 82604; 307-234-8113CHEVRON USA PRODUCTION CO; LA BARGE, WYOMING 83123; 307-386-2274CITATION OIL & GAS CORP; ROZET, WYOMING 82727; 307-682-9363CITATION OIL & GAS CORP; GILLETTE, WYOMING 82716; 307-682-1415CONTINENTAL RESOURCES INC; WORLAND, WYOMING 82401; 307-347-8216CORK PETROLEUM CORP; THERMOPOLIS, WYOMING 82443; 307-864-2057CORONADO OIL; NEWCASTLE, WYOMING 82701; 307-746-4392CROWN OIL & GAS CO INC; BIG PINEY, WYOMING 83113; 307-276-5211DCD INC; GILLETTE, WYOMING 82716; 307-682-4600DEVON ENERGY; WRIGHT, WYOMING 82732; 307-939-1274DEVON ENERGY CORP; RIVERTON, WYOMING 82501; 307-856-8111DEVON ENERGY CORP; WORLAND, WYOMING 82401; 307-347-2495DEVON ENERGY CORP; CASPER, WYOMING 82601; 307-472-0921ELLBOGEN CO; CASPER, WYOMING 82601; 307-234-3360ENSIGN OPERATING CO; GILLETTE, WYOMING 82718; 307-687-7903EOG RESOURCES; BIG PINEY, WYOMING 83113; 307-276-3331EQUITY OIL CO; CODY, WYOMING 82414; 307-587-7812EXXON PIPELINE CO; JEFFREY CITY, WYOMING 82310; 307-544-9610FOUR G OIL CO; CASPER, WYOMING 82604; 307-234-7813GOLDMARK ENGINEERING INC; MEETEETSE, WYOMING 82433; 307-868-2410GOLDMARK ENGINEERING INC; CASPER, WYOMING 82604; 307-237-8174GOLDMARK ENGINEERING INC; CODY, WYOMING 82414; 307-587-2458HAVOCO OIL CO; NEWCASTLE, WYOMING 82701; 307-746-2505HAWKS CO; CASPER, WYOMING 82601; 307-234-5363HOWELL PETROLEUM CORP; MIDWEST, WYOMING 82643; 307-437-9500INCLINE RESERVES INC; MC FADDEN, WYOMING 82083; 307-378-2403J P OIL CO; LANCE CREEK, WYOMING 82222; 307-334-3468KENNEDY OIL; GILLETTE, WYOMING 82716; 307-682-3107KOCH PRODUCTION LTD; WORLAND, WYOMING 82401; 307-347-2129L & J OPERATING INC; GILLETTE, WYOMING 82717; 307-682-8722LA BARGE MINERALS; LA BARGE, WYOMING 83123; 307-386-2365LUFF EXPLORATION CO; ROCK SPRINGS, WYOMING 82901; 307-382-2044MARATHON OIL CO; THERMOPOLIS, WYOMING 82443; 307-864-3038MARATHON OIL CO; THERMOPOLIS, WYOMING 82443; 307-867-2311MARATHON OIL CO; LOVELL, WYOMING 82431; 307-754-3033MARATHON OIL CO; POWELL, WYOMING 82435; 307-754-3796MARATHON OIL CO; WAMSUTTER, WYOMING 82336; 307-324-5501MARATHON OIL CO; RIVERTON, WYOMING 82501; 307-856-6180MARATHON OIL CO; WORLAND, WYOMING 82401; 307-347-3133MARATHON OIL CO; BYRON, WYOMING 82412; 307-548-2366MARATHON OIL CO; CODY, WYOMING 82414; 307-587-4961MERIT ENERGY; THERMOPOLIS, WYOMING 82443; 307-867-2321MERIT ENERGY; WRIGHT, WYOMING 82732; 307-464-0056MERIT ENERGY; GILLETTE, WYOMING 82716; 307-685-1400MERIT ENERGY CO; LANCE CREEK, WYOMING 82222; 307-334-2436MERIT ENERGY CO; BAGGS, WYOMING 82321; 307-383-6794MERIT ENERGY CO; MOUNTAIN VIEW, WYOMING 82939; 307-782-6463MID-CENTRAL PRODUCTION; EVANSTON, WYOMING 82930; 307-789-3585NEWARD CORP; DOUGLAS, WYOMING 82633; 307-358-5256NORTHSTAR OPERATING CO LLC; CASPER, WYOMING 82601; 307-577-0114NOVA ENERGY INC CASPER, WYOMING 82601 307-235-4863PARTNERSHIP AB; GILLETTE, WYOMING 82716; 307-682-7400PATHFINDER ENERGY INC; CASPER, WYOMING 82601; 307-472-5565PATHFINDER OPERATING CO; GILLETTE, WYOMING 82718; 307-686-5716PHOENIX PRODUCTION CO; BASIN, WYOMING 82410; 307-568-2933PHOENIX PRODUCTION CO; CODY, WYOMING 82414; 307-587-6440R M ENERGY; CASPER, WYOMING 82601; 307-577-1990RANCH OIL CO; BUFFALO, WYOMING 82834; 307-684-5334RIM OPERATING; GILLETTE, WYOMING 82718; 307-939-1395SNYDER OIL CORP; RIVERTON, WYOMING 82501; 307-856-7082STAR RESOURCES; GILLETTE, WYOMING 82716; 307-687-1541STOVALL OIL CO; CASPER, WYOMING 82601; 307-265-3523TEAPOT PRODUCTION INC; MILLS, WYOMING 82644; 307-472-0717TEXACO EXPLORATION & PRDCTN; ROCK SPRINGS, WYOMING 82901; 307-352-5100TEXACO INC; ROCK SPRINGS, WYOMING 82901; 307-352-5190TEXACO INC; BYRON, WYOMING 82412; 307-548-7395TEXACO PRODUCING INC; LA BARGE, WYOMING 83123; 307-386-2212THOROFARE RESOURCES INC; THERMOPOLIS, WYOMING 82443; 307-864-5112TOM BROWN INC; GILLETTE, WYOMING 82718; 307-682-1348TOWNSEND CO; NEWCASTLE, WYOMING 82701; 307-746-2487TOWNSEND CO; OSAGE, WYOMING 82723; 307-465-2311TRUE OIL CO; MOORCROFT, WYOMING 82721; 307-756-3245VERNON E FAULCONER INC; CODY, WYOMING 82414; 307-587-3964WESTERN OIL; PINE BLUFFS, WYOMING 82082; 307-245-3366WESTPORT OIL & GAS; KAYCEE, WYOMING 82639; 307-738-2553WESTPORT OIL & GAS CO; LINCH, WYOMING 82640; 307-437-6581WESTPORT OIL & GAS CO; LINCH, WYOMING 82640; 307-437-6581WOLD OIL PROPERTIES; CASPER, WYOMING 82604; 307-266-1545YATES PETROLEUM; ROCK SPRINGS, WYOMING 82901; 307-382-4005