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The online National Library of Medicine Classification, is available at http://wwwcf.nlm.nih.gov/class/. Beginning with the 2002 edition, the National Library of Medicine Classification is published in electronic form and updated annually.
To see the changes go to Scope of Revision at http://www.nlm.nih.gov/class/nlmclassintro.html#Scope
Additions and changes to the NLM classification scheme are announced on an irregular basis in the NLM Technical Bulletin at http://www.nlm.nih.gov/pubs/techbull/tb.html.
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http://www.nlm.nih.gov/services/cat_classchange.html
Last reviewed: 15 July 2008
Last updated: 15 July 2008
First published: 01 January 1998
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