IS-30 Bibliography and Index of Colorado Geology, 1984-1989 Download Publication Details Contains 22,000 citations about Colorado geology which are cross-indexed by subject and geography. 584 pages. Digital PDF download. IS-30D From the Foreword: This document updates our series of geological bibliographies and indexes through 1989. To our knowledge Colorado is the only state with a current bibliography which also extends back as far as 1875. The first of this type of product was the CGS Bulletin 37 (B-37) covering the century from 1875 through 1974. These continued with Bulletin 45 (B-45) covering 1975 through 1980, Information Series 19 IS-19) covering 1981- 1982, and Information Series 21 (IS-21) covering 1983 and is now complete with Information Series 30 covering 1984 through 1989. Citations in all these publications are included in the American Geological Institute GEOREF database Citations American Geological Institute. “IS-30 Bibliography and Index of Colorado Geology, 1984-1989.” Bibliography. Information Series. Denver, CO: Colorado Geological Survey, Department of Natural Resources, 1990. https://doi.org/10.58783/cgs.is30.kjtp1531. CGS Publications. https://coloradogeologicalsurvey.org/publications/bibliography-index-colorado-geology-1984-1989/.