MEDLINE

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Coverage: 
1966 to current, updated monthly
Citation to articles from about 3400 journals on medical research and clinical medicine. International coverage. Abstracts are provided for about 60% of the 1975+ articles. Searchable by National Library of Medicine (MeSH) headings as well as by key words from titles and abstracts.
Guides: 
The National Library of Medicine (NLM) offers an interactive online tutorial about PubMed. Use PubMed Help for quick questions.