Columbia subject headings:
Harvard subject headings:
Infrastructure (Economics)--Political aspects--Rome--Congresses.
Open spaces--Political aspects--Rome--Congresses.
Public spaces--Political aspects--Rome--Congresses.
Public works--Political aspects--Rome--Congresses.
Princeton subject headings:
Cities and towns, Ancient--Congresses.
Human settlements--History--Congresses.
Space (Architecture)--Congresses.