IS-78 Colorado Mineral and Energy Industry Activities 2014-2015 IS-78 Colorado Mineral and Energy Industry Activities 2014-2015
IS-48 Colorado Water Quality Database from the Environmental Protection Agency's STORET Database IS-48 Colorado Water Quality Database from the Environmental Protection Agency’s STORET Database
IS-21 Bibliography and Index of Colorado Geology IS-21 Bibliography and Index of Colorado Geology, 1983