Columbia subject headings:
Architecture--Italy--Florence.
Architecture--Italy--Tuscany.
Florence (Italy)--Buildings, structures, etc.
Plazas--Italy--Florence.
Plazas--Italy--Tuscany.
Harvard subject headings:
Architecture--Italy--Florence
Florence (Italy)--Buildings, structures, etc.
Plazas--Italy--Florence.
Princeton subject headings:
Architecture--Italy--Florence.
Florence (Italy)--Buildings, structures, etc.
Plazas--Italy--Florence.