The Library of Congress Authority file includes subject, name, title and name/title authority records created by or for the Library of Congress.

Subject cataloging depends on lists of controlled subject access vocabulary and thesauri. Library of Congress catalog records generally feature subject access points from one or more of the following thesauri and headings lists.

Browse or search for concepts on a variety of topics. See relationships linking terms. Available and searchable in the 6 UN official languages.