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GeoRef is the most comprehensive index to the literature of geology and earth sciences. Published by the American Geosciences Institute, GeoRef covers all aspects of geology from 1669 to the present for North America and 1933 to the present for the rest of the world. Containing over 3.3 million records, GeoRef indexes journal articles, books, maps, conference papers, reports and theses. It also includes references to all publications of the U.S. Geological Survey. Masters' theses and doctoral dissertations from U.S. and Canadian universities are also covered. To maintain the database, GeoRef editor/indexers regularly review more than 3,500 journals in 40 languages as well as new books, maps, and reports.