Citations to the international literature of geology.

In biology, complementary search results to BIOSIS Previews.

Major bibliographic database for medicine. 1946-.

(Public Affairs Information Service) references to related policy or other social science and legislative aspects of science topics can be identified here (for example, conservation policy, endangered species, wetlands, biodiversity).

Database of biomedical literature citations.

Online tutorial for using the PubMed database, from the National Library of Medicine.