Columbia subject headings:
Architecture--Conservation and restoration--Pennsylvania--Philadelphia.
Architecture--Pennsylvania--Philadelphia--Catalogs.
Buildings--Pennsylvania--Philadelphia--Catalogs.
Historic buildings--Conservation and restoration--Pennsylvania--Philadelphia--Catalogs.
Historic buildings--Pennsylvania--Philadelphia--Catalogs.
Harvard subject headings:
Architecture--Pennsylvania--Philadelphia--Conservation and restoration.
Historic buildings--Conservation and restoration--Pennsylvania--Philadelphia--Catalogs.
Princeton subject headings:
Architecture--Pennsylvania--Philadelphia--Conservation and restoration.
Historic buildings--Pennsylvania--Philadelphia--Conservation and restoration--Catalogs.