Physics and Astronomy 

The SAO/NASA Astrophysics Data System Abstract Service provides a gateway to the online Astronomy and Physics literature.

Citations and abstracts to articles from journals and conference proceedings, in physics, computing and control, electrical engineering, electronics, and information technology, from 1898 to the present

The premier source of mathematics literature, including mathematical physics. Indexes articles from 1940 to present.

Federated index to journal articles, conference proceedings, and standards from leading science and technology societies, plus patents from the U.S., European Patent Office, and Japan Patent Office.

Access to Science Citation Index from 1955 to present, Conference Proceedings Citation Index/Science from 2001 to present, Derwent Patent Index from 1995 to present, and Medline from 1950 to present.