NASA Astrophysics Data System

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NASA Astrophysics Data System Abstract Service provides a powerful search engine for each of its four bibliographic databases:

Astronomy and Astrophysics (895,726 records), including 89,103 abstracts from Planetary Sciences and Solar Physics journals
Instrumentation (668,818 records), including 168,529 abstracts from SPIE conference proceedings
Physics and Geophysics (1,431,756 records), including 344,588 abstracts from APS journals
ArXiv Preprints (234,327 records), consisting of all the papers published in the ArXiv e-print archive

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Astronomy