Columbia subject headings:
Historic buildings--Conservation and restoration--United States.
Historic buildings--Law and legislation--United States.
Historic preservation--United States.
Historic sites--Conservation and restoration--United States.
Historic sites--Law and legislation--United States.
United States. National Historic Preservation Act of 1966.
United States. National Park Service.
Harvard subject headings:
Historic buildings--Conservation and restoration--United States
Historic buildings--Law and legislation--United States
Historic sites--Conservation and restoration--United States
Historic sites--Law and legislation--United States
United States. National Park Service
Princeton subject headings: