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Publications of the Library of Congress are works of the United States Government as defined in the United States Code 17 U.S.C. §105 and therefore are not subject to copyright and are free to use and reuse.  The Library of Congress has no objection to the international use and reuse of Library U.S. Government works on loc.gov. These works are also available for worldwide use and reuse under CC0 1.0 Universal. 

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Credit Line: Law Library of Congress