Columbia subject headings:
Architecture--Italy--Rome--Guidebooks.
Architecture--Italy--Rome--History--20th century--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Architecture, Modern--20th century--Italy--Rome--Guidebooks.
Architecture--Italy--Rome--Guidebooks.
Architecture--Italy--Rome--History--Guidebooks.
Rome (Italy)--Buildings, structures, etc.--Guidebooks.
Princeton subject headings: