Columbia subject headings:
Architecture, Medieval--Conservation and restoration--Italy--Rome Region.
Exterior walls--Italy--Rome Region--Design and construction--History.
Historic buildings--Conservation and restoration--Italy--Rome Region.
Harvard subject headings:
Architecture, Medieval--Italy--Rome Region--Conservation and restoration.
Exterior walls--Italy--Rome Region--Design and construction--History.
Historic buildings--Conservation and restoration--Italy--Rome Region.
Princeton subject headings:
Architecture, Medieval--Italy--Rome Region--Conservation and restoration.
Exterior walls--Italy--Rome (Region)--Design and construction--History.
Historic buildings--Italy--Rome Region--Conservation and restoration.