Covers geology and physical geography with citations from 1669 to the present. The database includes all USGS publications, theses and dissertations from universities across North America and indexes more than 3,500 journals in 40 languages as well as new books, maps, and reports.
An abstract and citation database covering more than 17,000 peer-reviewed, open access, and trade journals, conference proceedings, and book series in the scientific, technical, medical and social sciences literature. Covers 386 million quality web sources and 22 million patents.