GeoRefS Indexes the geoscience literature of the world, including journal articles, books, maps, conference papers, reports, and theses. Subject coverage includes crystallography, economic geology, environmental geology, engineering geology, geochemistry, geophysics, hydrogeology, hydrology, marine geology, mineralogy, oceanography, and paleontology. Dates covered are: 1785 to present for North America and 1933 to present for international.