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