IS-21 Bibliography and Index of Colorado Geology IS-21 Bibliography and Index of Colorado Geology, 1983
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
B-41 Bibliography and Index of Publications Related to Coal in Colorado: 1972-1977 B-41 Bibliography and Index of Publications Related to Coal in Colorado: 1972-1977