Library of Congress Classification Outline
Lists the letters and titles of the main classes of the Library of Congress Classification. Click on any class to view an outline of its subclasses.
Library of Congress Linked Data Service
Search Subject Headings, free-floating subdivisions, Genre/Form headings, and Children's headings for available authority records.
This page from the Library of Congress offers a list of LC subject headings related to LGBTQ+ topics.