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MEDLINE
MEDLINE is a bibliographic database of life sciences and biomedical information. It includes bibliographic information for articles from academic journals covering medicine, nursing, pharmacy, dentistry, veterinary medicine, and health care. Wikipedia
Owner: National Library of Medicine
Cost: Free
History: 1879–present
No. of records: Over 29 million
Temporal coverage: 1946–present
Update frequency: Daily; 2,000-4,000 references per update