NTIS on Ovid (National Technical Information Service) is the major resource for locating U.S. Government sponsored research in the physical sciences, technology, engineering, biological sciences, medicine and health sciences, agriculture and social sciences.
The Scitation Database is a free database that offers current indexing and abstracting of ASME, ASCE and physics journals as well as journals from many other publishers. For a list of publishers, visit http://librarians.scitation.org/librarians/scitation_publishers.jsp
Scopus is an abstract and citation database of research literature and quality web sources, including journals, conference proceedings, trade publications, abstracts, and patent records. It is a multidisciplinary resource covering materials from the humanities, sciences and social sciences. Also indexes EMBASE articles. Scopus allows you to locate the most highly cited items and the articles that cite them.
Date Coverage: 1970-present; selected access back to 1823