GeoRef This link opens in a new windowProduced by the American Geosciences Institute, GeoRef contains citations and abstracts to more than 3,500 journals in 40 languages as well as new books, maps, conference papers, reports and theses. Major areas of coverage include areal geology, economic geology, engineering geology, environmental geology, extraterrestrial geology, geochemistry, geochronology, geophysics, hydrogeology and hydrology, marine geology and oceanography, mathematical geology, mineralogy and crystallography, paleontology, petrology, seismology, stratigraphy, structural geology, surficial geology. For further tips on searching, refer to search tips above.