NCBI is no longer updating this Tag Set with the rest of the Tag Suite. Version 2.3 is the last version.
Version 2.2 was released onNovember 2, 2006.
The files for Version 2.2 are available:
by anonymous FTP: ftp://ftp.ncbi.nih.gov/pub/archive_dtd/books/historical/
The Tag Library for version 2.2 is here: http://dtd.nlm.nih.gov/book/historical/tag-library/2.2/
A Frequently Asked Questions page is available.
Last updated: October 3, 2008