Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

This is a preview of updates coming to the Technical Bulletin's website in April 2026. Return to current site.
Read more about the modernization release schedule in this announcement.
Comment via the yellow feedback button in the lower right hand corner of the page. Contact the NLM Help Desk with any questions or concerns.

This is archived content.

Links may have become inactive over time. Visit Archive-It   to find the original published layout.

PDF Version of the NLM Classification Updated

PDF Version of the NLM Classification Updated. NLM Tech Bull. 2020 Jan-Feb;(432):b1.

January 02, 2020 [posted]

The PDF version of the NLM Classification has been updated with 2019 winter and summer classification data. You can download the three sections from links on the Terms and Conditions page.