https://www.loc.gov/aba/publications/FreeLCSH/freelcsh.html

This page provides print-ready PDF files for the 46th Edition of the Library of Congress Subject Headings (LCSH). Data for the 46th edition was selected in April 2025. For users desiring enhanced functionality, LCSH will continue as part of the web-based subscription product, Classification Web Plus.

https://id.loc.gov/authorities/subjects.html<br /> Library of Congress Subject Headings (LCSH)

https://id.loc.gov/<br /> Library of Congress Linked Data Service

Library of Congress Subject Headings (LCSH)<br /> https://en.wikipedia.org/wiki/Library_of_Congress_Subject_Headings