NLM Classification

A product of the National Library of Medicine for the arrangement of library materials in the field of medicine and related sciences used internationally. The NLM Classification is updated twice a year with the winter edition published in January and the summer edition published in August. Publication of printed editions ceased with the 5th revised edition, 1999. Beginning with the 2006 edition, the NLM Classification is also available in PDF (Portable Document Format) at https://www.nlm.nih.gov/class/terms_cond.html