NASA Astrophysics Data System
NASA-funded project which maintains four bibliographic databases containing more than 4.7 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy. Some full-text articles, as well as astronomy preprints, are available, including digitized historical astronomy and astrophysics literature.
URL to resource:
http://adswww.harvard.edu/
Coverage Dates:
1975 - present
Free Resource
