Includes Science Citation Index Expanded (1900-present), Conference Proceedings Citation Index- Science (1990-present), Data Citation Index (1900-present), Current Chemical Reactions (1985-present), Index Chemicus (1993-present), BIOSIS Citation Index (1926-present), Derwent Innovations Index (1963-present), MEDLINE® (1950-present), and more.
Started in August 1991, arXiv.org is an electronic archive and distribution server for research articles. Covered areas include physics, mathematics, computer science, nonlinear sciences, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.
Indexes major astronomy and astrophysics journals. The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant.
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Contains chemical substances, reactions and literature references from thousands of journals and 63 patent authorities as well as technical reports, books, conference proceedings, and dissertations published globally. Coverage: More than 48 million records from publications dating back to the early 1800s, with continuous coverage since 1907. Also includes MEDLINE.