IS-45 Active Permitted Mine Operations in Colorado IS-45 Active Permitted Mine Operations in Colorado, 1996-1997
RS-33 Spanish Peak Field RS-33 Spanish Peak Field, Las Animas County, Colorado: Geologic Setting and Early Development of a Coalbed Methane Reservoir in the Central Raton Basin
RS-34 Penetration Charts of Selected Colorado Oil and Gas Fields RS-34 Penetration Charts of Selected Colorado Oil and Gas Fields
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-98-06 Preliminary Evaluation of Mineral and Mineral Fuel Potential of the 130 Tracts of State Trust Land Nominated by the Public for Inclusion in the Stewardship Trust (Round 1) (detail) OF-98-06 Preliminary Evaluation of Mineral and Mineral Fuel Potential of the 130 Tracts of State Trust Land Nominated by the Public for Inclusion in the Stewardship Trust (Round 1)
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
RS-31 Coalbed Methane in the Upper Cretaceous Fruitland Formation RS-31 Coalbed Methane in the Upper Cretaceous Fruitland Formation, San Juan Basin, New Mexico and Colorado