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-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
MS-21 Groundwater Temperatures Map of Colorado (detail) MS-21 Groundwater Temperatures Map of Colorado