Abstract and Preprint Servers

The Astrophysics Data System (ADS) Astronomy and Astrophysics Search
The ADS Physics and Geophysics Search
arXiv.org e-Print archive
CERN Document Server
Google Scholar

Journals

Acta Astronomica - AcA
Advances in Space Research - AdSpR
Annual Review of Astronomy and Astrophysics - ARAA
The Astronomer's Telegram - ATel
Astronomical Journal - AJ (issues from 1998)
Astronomische Nachrichten (Astronomical Notes) - AN
Astronomy & Astrophysics - A&A
Astronomy & Astrophysics Review - A&AR
Astronomy and Astrophysics Supplement Series A&AS (Final Issue: Dec 2000)
Astronomy and Geophysics - AG
Astronomy Letters - AL (English translation of Pis'ma v Astronomicheskii Zhurnal
Astronomy Reports - AR (English translation of Astronomicheskii Zhurnal
Astroparticle Physics
The Astrophysical Journal - ApJ (issues from 1997)
The Astrophysical Journal Letters - ApJL (issues from 1995)
The Astrophysical Journal Supplement - ApJS (issues from 1997)
Astrophysics and Space Science - ApSS
Icarus
IAU: Central Bureau for Astronomical Telegrams - CBAT
Journal of Astronomical Data - JAD
Journal of Astrophysics & Astronomy - JAA
Journal for the History of Astronomy - JHA
Legacy Journal
Monthly Notices of the Royal Astronomical Society - MNRAS
Monthly Notices of the Royal Astronomical Society Letters - MNRAS Letters
Nature
New Astronomy Journal - NAJ
New Astronomy Reviews - NAR
The Observatory
Publications of the Astronomical Society of Australia - PASA
Publications of the Astronomical Society of Japan - PASJ
Publications of the Astronomical Society of the Pacific - PASP
Research in Astronomy and Astrophysics (RAA)
Revista Mexicana de Astronomia y Astrofisica
Science Magazine
Space Science Reviews

Other resources

NASA's Physics of the Cosmos (PCOS) Program
NASA's Cosmic Origins (COR) Program