GeoRef This link opens in a new windowGeoRef is the major index to the geological literature from 1785 to present. Covers all aspects of terrestrial and extraterrestrial geology, geochemistry, geophysics, mineralogy, petrology, economic geology, hydrology, oceanography, geomorphology, geoarchaeology, and engineering geology. Includes records for geologic maps, conference proceedings, dissertations, technical papers and reports, and books.