This bibliographic database is provided by the US Department of Energy. It covers literature from 1948, but mainly from 1994 onwards. Citations are to reports, conference papers, journal articles, books, dissertations, and patents.
CiteSeerX is an evolving scientific literature digital library and search engine that has focused primarily on the literature in computer and information science.
Full text of the journals published by the Institute of Physics (IOP).
Canadians can enjoy free access to over 100,000 back files of NRC Research Press journals, dating back to 1951.