IS-18 Oil and Gas Fields of Colorado: Statistical Data through 1981 IS-18 Oil and Gas Fields of Colorado: Statistical Data through 1981
IS-19 Bibliography and Index of Colorado Geology 1981-1982 IS-19 Bibliography and Index of Colorado Geology 1981-1982
IS-23 Results of a Search for Felt Reports for Selected Colorado Earthquakes IS-23 Results of a Search for Felt Reports for Selected Colorado Earthquakes
IS-22 Annotated Bibliography of Subsidence Studies over Abandoned Coal Mines in Colorado [2010 update] IS-22 Annotated Bibliography of Subsidence Studies over Abandoned Coal Mines in Colorado [2010 update]
IS-33 Gold Panning and Placering In Colorado: How and Where IS-33 Gold Panning and Placering In Colorado: How and Where
IS-77 Colorado Mineral and Energy Industry Activities IS-77 Colorado Mineral and Energy Industry Activities, 2007
IS-74 Lower Arkansas River Alluvial Aquifer: Geographic IS-74 Lower Arkansas River Alluvial Aquifer: Geographic, Digital Bibliography
IS-75 Colorado Mineral and Energy Industry Activities 2006 IS-75 Colorado Mineral and Energy Industry Activities 2006
IS-73 Colorado Mineral and Energy Industry Activities 2005 IS-73 Colorado Mineral and Energy Industry Activities 2005
IS-70 Colorado Minerals and Mineral Fuel Activity Report 2004 IS-70 Colorado Minerals and Mineral Fuel Activity Report 2004