GeoRef This link opens in a new windowThis database is a comprehensive geoscience resource containing over 2.2 million bibliographic records covering subjects such as mineralogy and crystallography, general mineralogy, mineralogy of silicates, and mineralogy of non-silicates. Bibliographic records from more than 3,000 journals are included in the database as well as journal articles, books, maps, conference papers, reports, and theses. Over 60,000 references are added to the GeoRef database annually. Geology of North America is covered from 1785 to the present, and geology of the world is covered from 1933 to the present.