The NLM Classification is available online at http://wwwcf.nlm.nih.gov/class/ and it incorporates all additions and changes from April 2005 through March 2006.

This edition includes an online tutorial on searching the NLM Classification.

Some the changes

• Proteins and bacteria were the major areas revised for the 2006 edition. Several class numbers were added and canceled.
• Ninety-eight (98) new main index entries were created, fifty-seven (57) of which are from the 2006 MeSH; the remainder are MeSH terms from previous years.
• Numerous main index entries and cross references were modified to reflect changes in the MeSH vocabulary.
• Various instructional notes were added to index entries to clarify classification practices.

To learn more about the NLM Classification see the Fact Sheet.