GeoRef This database, established by the American Geological Institute (AGI) in 1966, provides access to the geoscience literature of the world. GeoRef is the most comprehensive AGI database in the geosciences and continues to grow by more than 100,000 references a year. The database contains over 3 million references to geoscience journal articles, books, maps, conference papers, reports and theses.
Web of Science The Web of Science (citation indexes), published by the Institute for Scientific Information (ISI), is a multidisciplinary database, with searchable author abstracts, covering the journal literature of the sciences, social sciences and arts. It indexes major journals in these disciplines. Because the information stored about each article includes the article's cited reference list (often called its bibliography), you can also search the databases for articles that cite a known author or work. The search interface at this web site provides access to Science Citation Index,Social Sciences Citation Index and Arts & Humanities Citation Index
For more information see the Earth Sciences website or search the A-Z database of online resources available in Cambridge