Covers the worlds literature in geology and the geosciences. GeoRef covers the geology of North America since 1785 and the geology of the rest of the world since 1933. Citations to articles, some with abstracts, in 40 languages. Also includes books, maps, reports, most U.S. Geological Survey publications and U.S. and Canadian masters theses and doctoral dissertations. (Coverage: North America 1785 -- ; other areas of the world 1933 --)