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NLM Classification Updated, April 23, 2009

The online National Library of Medicine Classification, available at http://www.nlm.nih.gov/class/, has been issued in a newly revised edition as of April 23, 2009.

Seventeen new class numbers were added to the main schedules and four new class numbers were added to the 19th Century schedule (http://www.nlm.nih.gov/class/19thcenturyschedule.html). One class number was canceled. Eighty-one MeSH terms were added to the index, including 34 new to the MeSH vocabulary as of 2009; in addition, 71 schedule records and 580 index entries were updated since the 2008 edition was published on April 24, 2008.

Contact NLM for further information, questions, or comments.

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