Web Archives:

Cornell University Library Archives: Arxiv.org

Stanford Linear Accelerator Center(SLAC):Spires

The NASA Astrophysics Data System

Physical Review Online Archive

Science Direct

Journals:

APS Journals: Physical Review A-E, Physical Review Letters, Reviews of Modern Physics.

Elsevier Journals: Annals of Physics, Astroparticle Physics, Nuclear Physics A-B & Supplements, Physica A-E, Physics Letters A-B, Physics Reports, Reports on Mathematical Physics, etc ...

AIP Journals:   Journal of Mathematical Physics

Springer Journals:  Communications in Mathematical Physics, Letters in Mathematical Physics , Theoretical and Mathematical Physics