NASA Astrophysics Data System
| Description | Astrophysics Data System (ADS) is a NASA-funded project which maintains four bibliographic databases: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy. The main body of data in the ADS consists of bibliographic records, and full-text scans of much of the astronomical literature. |
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| Subjects | Astronomy |
| URL | http://adswww.harvard.edu/ |
| Subscription | Free |
| Alumni Access | No |