Columbia subject headings:
Historic buildings--Conservation and restoration--United States.
Historic buildings--Conservation and restoration.
Historic sites--Conservation and restoration.
History--Methodology.
Harvard subject headings:
Historic buildings--Conservation and restoration
Historic buildings--Conservation and restoration--United States
Historic sites--Conservation and restoration
History--Methodology
Princeton subject headings:
Historic buildings--Conservation and restoration--United States.
Historic buildings--Conservation and restoration.
Historic sites--Conservation and restoration.
History--Methodology.