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SIMBAD Astronomical Database
The SIMBAD astronomical database provides basic data, cross-identifications and bibliography for astronomical objects outside the solar system. SIMBAD can be queried by object name, coordinates, other criteria (filters), and lists of objects.
http://simbad.u-strasbg.fr/Simbad
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The NASA Astrophysics Data System
The Astrophysics Data System (ADS) is a NASA-funded project which maintains four bibliographic databases containing more than 4.0 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy.
http://adswww.harvard.edu/
Harvard.edu ~
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