Library of Congress

Cataloging Distribution Service

The Library of Congress > Cataloging Distribution Service > Subject Heading Authority Control

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Help in all areas of subject access is available through these tools. Published in various formats, the major subject headings authority tools listed here include the six-volume Library of Congress Subject Headings, the web-based subscription service, Classification Web, and Subject Headings Manual and updates. Many, but not all, of these publications are also available in the web-based subscription service, Cataloger's Desktop. Many of these resources are now being converted into free downloads at http://www.loc.gov/aba/. Check that website frequently for newly added publications.