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The National Library of Medicine (NLM) classification system is a library indexing system covering the fields of medicine and preclinical basic sciences. The NLM classification is patterned after the Library of Congress (LC) Classification system : alphabetical letters denote broad subject categories which are subdivided by numbers. [ 1 ]
The United States National Library of Medicine (NLM), operated by the United States federal government, is the world's largest medical library. [ 5 ] Located in Bethesda, Maryland , the NLM is an institute within the National Institutes of Health .
MeSH was introduced in the 1960s, with the NLM's own index catalogue and the subject headings of the Quarterly Cumulative Index Medicus (1940 edition) as precursors. The yearly printed version of MeSH was discontinued in 2007; MeSH is now available only online. [2] It can be browsed and downloaded free of charge through PubMed.
MEDLINE (Medical Literature Analysis and Retrieval System Online, or MEDLARS Online) 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.
PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.
Index Medicus was begun by John Shaw Billings, head of the Library of the Surgeon General's Office, United States Army. This library later evolved into the United States National Library of Medicine (NLM). For such a major publication over many years the history naturally involved many changes as people died and sources of funding changed.
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It is a product of the United States National Library of Medicine (NLM). The prefixes (A01, etc.) are linked to more extensive sub-lists of codes; the medical terms are linked to articles on those topics. The source for this content is the set of 2024 MeSH Trees from NLM. [2] A – Anatomy. A01 – body regions (74 articles)