The Copyright Card Catalog and the online files of the Copyright Office.
Edition: Rev. June 1999.
Series: Circular -- 23.; Circular (Library of Congress. Copyright Office) -- 23.
Publisher: Library of Congress, Copyright Office
Published: 1999
Place of publication: Washington, D.C. (101 Independence Avenue, S.E., Washington 20559-6000)
Language: eng
Subjects: Copyright -- United States -- Information services; Catalogs, Card; Online library catalogs -- United States
Notes: Caption title.

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