Established by the American Geological Institute (AGI) in 1966. Includes references to all publications of the U.S. Geological Survey. Master's theses and doctoral dissertations from US and Canadian universities are also covered. To maintain the database, GeoRef editor/indexers regularly scan more than 3,500 journals in 40 languages as well as new books, maps, and reports. They record the bibliographic data for each document and assign index terms to describe it. Each month between 4,000 and 7,000 new references are added to the database. Search interface: Proquest.

Sources include scholarly and general interest titles, as well as government documents and reports. Contains abstracting & indexing for more than 600 titles, including complete coverage for Bioscience (back to 1964), Conservation Biology (back to 1987), Journal of Ecology (back to 1913) and Journal of Environmental Planning & Management (back to 1948).