Library of Congress classification numbers. | Watson Library stack map: Click Here
The Library of Congress subject headings system was originally designed as a controlled vocabulary for representing the subject and form of the books and serials in the Library of Congress collection, with the purpose of providing subject access points to the bibliographic records contained in the Library of Congress catalogs.
As an increasing number of other libraries have adopted the Library of Congress subject headings system, it has become a tool for subject indexing of library catalogs in general.
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