by Library of Congress
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The national union catalog
A catalog of books represented by Librar...
Library of Congress catalog [of] books
Library of Congress catalogue [of] books
Report of the Librarian of Congress
Subject headings used in the dictionary ...
![Subject headings used in the dictionary catalogs of the Library of Congress [from 1897 through December 1955] 6th ed](https://covers.openlibrary.org/b/id/12737369-M.jpg)