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The National Institutes of Health (NIH) is the nation’s premier medical research agency, with 27 different institutes and centers. The National Library of Medicine (NLM) at the NIH is the world’s largest medical library. NLM provides free, trusted health information to you through MedlinePlus and NIH MedlinePlus magazine. PubMed is comprised of more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Many citations include links to full- text content from PubMed Central and publisher web sites.

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Digital Collections is the National Library of Medicine's free online repository of biomedical resources including books, manuscripts, still images, videos, and maps. The content in Digital Collections is freely available worldwide and, unless otherwise indicated, in the public domain. Digital Collections is the National Library of Medicine's free online repository of biomedical resources including books, manuscripts, still images, videos, and maps. The content in Digital Collections is freely available worldwide and, unless otherwise indicated, in the public domain. Digital Collections is the National Library of Medicine's free online repository of biomedical resources including books, manuscripts, still images, videos, and maps. The content in Digital Collections is freely available worldwide and, unless otherwise indicated, in the public domain.