Provides over 2.2 million citations from over 3,500 journals, serials, maps, theses and dissertations, government publications, books, and reports in the fields of geology and geophysics, including information on energy sources, volcanic eruptions, earthquakes, groundwater pollution, nuclear reactor sites, landslides, and erosion, as well as the history of the earth, the structure of the earth, the study of ore deposits, and geostatistics. The database is updated every two weeks with approximately 3,000 new records. Note: GeoRef In Process contains records, not necessarily recent ones, which are currently being indexed by GeoRef. The GeoRef Preview at AGI database contains the most recently indexed records, not yet fully indexed for the main GeoRef file. For the most complete searches, search all three: GeoRef, GeoRef In Process and GeoRef Previews.