- Central Online & Open Access Library (COOL) : The aim is to provide an open online platform (reference library) and an open online reference and linking system (reference catalogue) for the scientific electronic publications of scientific associations and organizations. A service of Copernicus.org
- Journal of Physical and Chemical Reference Data Reprints (NIST) : Reprints published from Volume 1 (1972) through Volume 27 (1998). See also the JPCRD link below, under EJOURNALS.
- Physics (NIST) : NIST Physics Program produces the most comprehensive set of reliable physical reference data available anywhere; their collection includes atomic energy levels, transition probabilities, and collision data can be used for characterizing and modeling all types of gaseous systems, including plasmas, planetary atmospheres, and astrophysical media, and for health physics applications. The NIST Chemistry WebBook now contains electronic and vibrational spectra for over 4000 compounds. The WebBook also contains constants of diatomic molecules. The SRD Group has also produced several important compilations of molecular data.
- Physical Review Focus : American Physical Society (APS). Selections from Physical Review and Physical Review Letters, explained for students and researchers. With an Image Index, and text search function. Archive dates to March 1998.
- Physics Review Online Archive (PROLA): Browse and search the bibliographic records for all APS journals, 1893 to present. Full-text article content is only accessible by subscription to the PROLA archive.
- Scientific Reference Linking System (SREF) : A database, in which links to the publications of participating publishers are stored. Search online journals (1980-present); view list of SRef publications. A service of Copernicus.org
- Scitation (AIP) : Formerly the Online Journal Publishing Service - OJPS, Scitation is the online home of more than 100 journals from AIP, APS, ASCE, ASME, SPIE, and a host of other prestigious science and engineering societies. For users with no library or personal subscriptions registration enables access to abstracts for which full text is available. Publications can be viewed alphabetically, by subject category, or publisher.
- SPIRES HEP : From the Stanford Linear Accelerator Center (SLAC) with more than 500,000 high-energy physics related articles, including journal papers, preprints, e-prints, technical reports, conference papers and theses comprehensively indexed. A centralized collection of official and personal documents is in development.
*This list put together by the Library of Congress Science Reference Services