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As required by 17 U.S.C. 403, third parties producing copyrighted works consisting predominantly of the material produced by U.S. government agencies must provide notice with such work(s) identifying the U.S. Government material incorporated and stating that such material is not subject to copyright protection.
The information on government web pages is in the public domain unless specifically annotated otherwise (copyright may be held elsewhere) and may therefore be used freely by the public.