Columbia subject headings:
Plazas--Italy--Tuscany--Pictorial works.
Tuscany (Italy)--Buildings, structures, etc.--Pictorial works.
Harvard subject headings:
Plazas--Italy--Tuscany--History--Pictorial works.
Plazas--Italy--Tuscany--History.
Tuscany (Italy)--Buildings, structures, etc.
Princeton subject headings:
Plazas--Italy--Tuscany--Pictorial works.
Tuscany (Italy)--Buildings, structures, etc.--Pictorial works.