71 Construction
Ames Construction
Amoco
Anschutz Exploration
ARCH Mineral
Barrett Resources
BHP Minerals Corporation
Burlington Northern Railroad
Carbon Coal Company / Cyprus -Shoshoni Coal
Colorado Interstate Gas
Conoco
Consolidation Coal Corporation
Decker Coal Mine
El Paso Natural Gas Pipeline Company
Foundation Coal West
Gilbert Western / Peter Kiewit Corp.
High Plains Construction Company
HK Contractors
Jacobs Ranch Mine Coal Company
JTL Group, Inc.
Jomax Construction
Kennecott Utah Copper
Kerr McGee Corporation
KN Energy
LaFarge, Inc.
Lee Ranch Mine
Lewis & Lewis
McGarvin - Moberly Construction
Mountain Construction Company
Northwinds of Wyoming
Oftedal & Sons, Inc.
Pacificorp
Peabody Western Coal Company
Petrotomics Company
Phelps-Dodge Mining Company
Powder River Coal Company
Reiman Corporation
Shell Oil Company
Simon Contractors
TetraTech Corporation
Texaco
TIC, Incorporated
Triton Oil Company
Union Pacific Railroad
And many others