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Produced by the American Geosciences Institute, is a geosciences database containing over 3.3 million bibliographic records to the geoscience literature of the world. Among the subjects covered are: environmental and engineering geology, hydrology, economic geology, geophysics, petrology, paleontology, marine geology and oceanography, and mineralogy. Over 3,500 journals are reviewed for indexing as well as books, maps, government reports, conference papers, and theses and dissertations. The geology of North America is covered from 1669 to the present, and coverage dates back to 1933 for the rest of the world.