IS-44 Colorado Mineral and Mineral Fuel Activity IS-44 Colorado Mineral and Mineral Fuel Activity, 1997
IS-45 Active Permitted Mine Operations in Colorado IS-45 Active Permitted Mine Operations in Colorado, 1996-1997
RS-35 Alkalic Igneous Rocks of Colorado and Their Associated Ore Deposits RS-35 Alkalic Igneous Rocks of Colorado and Their Associated Ore Deposits
RS-36 Availability of Coal Resources in Colorado: Somerset Quadrangle RS-36 Availability of Coal Resources in Colorado: Somerset Quadrangle, West-Central Colorado
OF-98-05 Demonstrated Reserve Base for Coal in the Colorado Somerset Coal Field OF-98-05 Demonstrated Reserve Base for Coal in the Colorado – Somerset Coal Field
IS-42 Colorado Minerals and Mineral Fuel Activity IS-42 Colorado Minerals and Mineral Fuel Activity, 1996
RS-32 Directory and Statistics of Colorado Coal Mines with Distribution and Electric Generation Map RS-32 Directory and Statistics of Colorado Coal Mines with Distribution and Electric Generation Map, 1995-96
IS-40 Colorado Minerals and Mineral Fuel Activity IS-40 Colorado Minerals and Mineral Fuel Activity, 1995
IS-41 Active Permitted Mine Operations in Colorado IS-41 Active Permitted Mine Operations in Colorado, 1995-96
IS-39 Colorado Mineral and Mineral Fuel Activity IS-39 Colorado Mineral and Mineral Fuel Activity, 1994