Columbia subject headings:
Open spaces--Italy--Rome.
Plazas--Italy--Rome--Pictorial works.
Rome (Italy)--Buildings, structures, etc.
Rome (Italy)--Pictorial works.
Harvard subject headings:
Plazas--Italy--Rome--History.
Rome (Italy)--Description and travel.
Vasi, Giuseppe, 1710-1782.
Princeton subject headings:
Plazas--Italy--Rome--History.
Rome (Italy)--Description and travel.