Subject Headings
Official Library of Congress guidance for standardized subject vocabularies.
Cataloging
Subject headings and cataloging references
Cataloging helps libraries describe and organize resources. Subject headings provide standardized terms that make information easier to discover.
OPEN RESOURCE
Library of Congress Subject Headings
Free alphabetical LCSH PDF files and cataloging reference material.
Library of Congress Subject Headings — Google Books
Digitized reference edition for study alongside current official headings.