It is not a true thesaurus, though, because for historical reasons it does not completely conform to the international standard on thesaurus construction. It also indicates relationships between and among headings. A single word or phrase is chosen to represent each concept that is included, and synonyms are provided as see-references to that heading. It is popularly known by its abbreviation as LCSH and is sometimes used interchangeably with the phrase subject authority file. LCSH is a controlled vocabulary. Library of Congress Subject Headings (LCSH) is the list of headings produced from the subject authority file maintained by the United States Library of Congress for use in bibliographic records.
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