-EJournals
-Major Preprints

-Reference Resources
-Laboratories
-Data Sources

-Reference Resources
-Observatories
-Image Sources

Indexes and Databases

• American Astronomical Society - Now hosted by IOP; one can search the entire IOP database, including the AAS journals.
• ADS Abstract Service (NASA Astrophysics Data System) - provides search system for its four bibliographic databases: 1) Astronomy and Astrophysics, 2) Instrumentation, 3) Physics and Geophysics, 4) ArXiv Preprints
• arXiv.org E-Print Archive
• CAS (Chemical Abstracts)- see Scifinder Scholar below.
• The Catalog of U.S. Government Publications (CGP)
• COMPENDEXEngineering Index
• The constants and equations pages - from tcaep.co.uk, published by scenta, in association with the Institute of Physics.
• INSPEC Physics Abstracts
• Institute of Physics (IOP)
• JSTOR - Full-text archives of a wide variety of journals, including several important science publications
• MathSciNet Access to Mathematical Reviews
• NASA/IPAC Extragalactic Database (NED) - operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Contains databases of Objects, Data, Literature References,Knowledgebase, Tools, and more...
• National Technical Information Service NTIS - "...the largest central resource for government-funded scientific, technical, engineering, and business related information..." (NTIS)
• Science.gov Contains reliable information resources selected by respected U.S. Government agencies as their best science information
• Science Citation Index - see Web of Science
• Scifinder Scholar
  - Physics Content 23% of CA's content focuses on physics, with 4.9 million references
• Scitation AIP's publishing platform, allowing searching across all Scitation journals; also includes link to the SPIN database
• SpringerLink - Springer's electronic platform allowing searching across entire scope of their electronic content.
• US Dept. of Energy Citations Database - "...includes bibliographic records of literature in disciplines of interest to DOE such as chemistry, physics, materials, environmental science, geology, engineering, mathematics, climatology, oceanography, computer science and related disciplines. It includes citations to report literature, conference papers, journal articles, books, dissertations, and patents." (Energy Citations Database)
• US Dept. of Energy Information Bridge - 1995 forward. "...provides the open source to full-text and bibliographic records of Department of Energy (DOE) research and development reports in physics, chemistry, materials, biology, environmental sciences, energy technologies, engineering, computer and information science, renewable energy, and other topics." (Information Bridge)
• Web of Science