A medical and health database developed at the National Library of Medicine (NLM).  [tutorial]  [basic info pdf] [more info]
The Cochrane Library is a unique source of reliable and up-to-date information on the effects of treatment interventions in health care.
[more info]
Indexing and abstracts for articles, books and other publications in nursing and allied health. [more info]
Indexing, abstracts, and citation searching for science and social science scholarly literature... [more info]
Lexi-Comp provides industry-leading, point-of-care drug information through clinical information databases. [more info]