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Why am I retrieving MEDLINE citations with publication dates prior to 1949?

April 26, 2017citations dates MEDLINE prior publication retrieving

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Why am I retrieving MEDLINE citations with publication dates prior to 1949?

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MEDLINE contains citations indexed 1949 to the present. Approximately 5,500 citations are for articles that were published earlier, but appeared in indexes published in 1949 or later. For more information on: • OLDMEDLINE Data http://www.nlm.nih.gov/databases/databases_oldmedline.html • MEDLINE Fact Sheet http://www.nlm.nih.gov/pubs/factsheets/medline.html Return to the list of FAQs http://www.nlm.nih.gov/services/faq.