SAO/NASA Astrophysical Data SystemAnyone can use

The SAO/NASA Astrophysics Data System (ADS) is a Digital Library, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three bibliographic databases covering publications in Astronomy and Astrophysics, Physics, and the arXiv e-prints. Abstracts and full-text of major astronomy and physics publications are indexed and searchable through the new ADS “Bumblebee” interface as well as the traditional “Classic” search forms. A set of browsable interfaces are also available.

Date Coverage: 1500s-present

Maximum Users: Unlimited

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