Columbia subject headings:
Architecture--Italy--Rome.
City planning--Italy--Rome--History.
Open spaces--Italy--Rome.
Rome (Italy)--Buildings, structures, etc.
Harvard subject headings:
City planning--Congresses
City planning--Italy--Rome
Italy--Antiquities, Roman--Congresses.
Rome (Italy)--Antiquities--Congresses.
Rome (Italy)--Buildings, structures, etc.--History--Congresses.
Rome (Italy)--History--To 476--Congresses.
Princeton subject headings:
Rome (Italy)--Antiquities--Congresses.
Rome (Italy)--History--Congresses.