Agapito and Associates, Inc.
Babcock and Wilcox
Dr. E. Behen
Charter Oil Company
Chevron USA Production Company
Church and Dwight
Ciavonne and Associates
Clearly, Gottlieb, Steen and Hamilton
Cliffs Engineering, Inc.
Coal Conversions, Inc.
Coleman, Jouflas, and Williams, P.C.
EOG Resources, Inc.
Denison Resources N.L.
First National Bank
Giauque and Williams, P.C.
Industrial Resources, Inc.
Intermountain Mining Ltd.
Mincer, Hartert and Wilson, P.C.
Minerales Para La Industria
Miocene Resources
Natec Ltd.
National Fuel Corporation
Natrona Resources
Natural Soda, Inc.
Nelson, Hoskin and Farina, P.C.
Newfield Exploration
North American Silver and Gold Company
NorWest Mine Services, Inc.
Plateau Resources LTD.
RTZ Corporation
Shell Exploration and Production Co. (SEPCo)
Shell Rocky Mountain Production, L.L.C.
Shell International Exploration and Production Company
Shell Frontier Oil and Gas Company
Shell Western Exploration and Production, Inc.
Slater and Associates, P.C.
Steigers Corporation
Harry Tucker, P.C.
Union Pacific Railroad
US Borax, Inc.
Vitro Industrias Basicas
H. K. Webster, P.C.
Williams Production Company
Williams, Turner, and Holmes, P.C.
Yankee Gulch Joint Venture