Publication coverage: Geology of North America: 1693 - present ; Geology worldwide: 1933 - presentEstablished by the American Geological Institute (AGI) in 1966, GeoRef indexes over several thousand journals in 40 languages as well as books, maps, reports, most U.S. Geological Survey publications, and American and Canadian masters and doctoral theses.
Publication coverage: Varies by publicationComprises more than 45,000 records of publications released by Canada Centre for Remote Sensing (CCRS) or Geological Survey of Canada (GSC) authors.
Publication coverage: 1947 - presentThis web portal, formerly known as SciTech Connect, contains more than 3 million references (445,000 full-text) to reports, articles, patents, datasets, presentations, software, and other scientific and technical information arising from research supported by the U.S. Department of Energy.
Publication coverage: 1900-1975TRAIL contains digital copies of more than 65,000 U.S. government technical reports published by various agencies, mainly from the mid to late 20th century. Documents are added on an ongoing basis.