ADS the SAO/NASA Astrophysics Data System SciX-Science Explorer (Next-generation ADS interface)
Proceedings (search proceedings scanned by ADS)* Riviste (search astronomical journals scanned by ADS)* Pubblicazioni di Osservatori(search Observatories publications scanned by ADS)* * select publication with the mouse, type volume number (and page, eventually), then click on "send request"
ArXiv.org Cern Dissertation Data base Open Research Europe (ORE)
High Energy Astrophysics Science Archive Research Center IRSA - The Infrared Science Archive MAST The Mikulski Archive for Space Telescopes NASA/IPAC Extragalactic Database NASA Space Science Data Coordinated Archive Physical Reference Data Simbad Vizier
The Feynman Lectures on Physics Numerical recipes on-line
Directory Open Access Journals Journal of Physics: Conference Series JSTOR Journals (partially restricted access)
The IAU Astronomy Thesaurus Unified Astronomy Thesaurus - UAT VIAF - Virtual International Authority File Web of Science - Journal Title Abbreviations