The IS-21 bibliography contains Colorado geology citations that are cross-indexed by subject, county, and rock type. 127 pages. Digital PDF download. IS-21D
Colorado is one of the few states with geological bibliographic coverage extending back as far as 1875. The first bibliography is CGS Bulletin 37 (B-37) covering the years 1875 through 1974; the next, Bulletin 45 (B-45) covers 1975 through 1980; Information Series 19 (IS-19) covers 1981-1982, and finally this publication covering 1983. A later publication completes the series, Information Series 30 (IS-30) extends coverage through 1989. Citations in all these publications are included in the American Geological Institute GEOREF database.