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