Columbia subject headings:
Central places--Italy--Rome.
City planning--Italy.
City planning--Rome.
Plazas--Rome.
Harvard subject headings:
Architecture, Modern--18th century--Italy--Rome.
Central places--Italy--Rome.
City planning--Italy--Rome
Plazas--Italy--Rome.
Princeton subject headings:
Central places--Italy--Rome.
City planning--Italy--Rome.
Plazas--Italy--Rome.