Columbia subject headings:
Architecture--Italy--Rome.
Rome (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture--Italy--Rome--Guidebooks.
Monuments--Italy--Rome--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Rome (Italy)--Guidebooks.
Princeton subject headings:
Architecture--Italy--Rome.
Rome (Italy)--Buildings, structures, etc.