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Astrophysics Data System (ADS)

The NASA Astrophysics Data System (ADS)is a digital library for astronomy and astrophysics. It also covers other subject areas including electrical engineering, geophysics, physics, and instrumentation. For scanned journals, coverage goes back to Volume 1. For journals not yet scanned, coverage usually goes back to 1975. Sources of data and information include journals, books, conference proceedings, observatory reports and newsletters, some NASA reports, and PhD theses.
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Harvard-Smithsonian Center for Astrophysics

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