GeoRef This link opens in a new windowProduced by the American Geological Institute, GeoRef is a comprehensive geosciences database containing over 2.8 million bibliographic records to the geoscience literature of the world. Over 3,500 journals are reviewed for indexing in the GeoRef database, as well as books, maps, government reports, conference papers, and theses and dissertations. The GeoRef database covers the geology of North America from 1785 to the present and the geology of the rest of the world from 1933 to the present.