Columbia subject headings:
Rome (Italy)--Economic conditions--Congresses.
Rome (Italy)--Population--Congresses.
Rome (Italy)--Social conditions--Congresses.
Harvard subject headings:
Demography--Italy--Rome--Congresses.
Rome (Italy)--Economic conditions--Congresses.
Rome (Italy)--Population--Congresses.
Rome (Italy)--Population--History--Congresses.
Rome (Italy)--Social conditions--Congresses.
Princeton subject headings:
Families--Italy--Rome--History.
Rome (Italy)--Population--History.
Rome (Italy)--Social conditions.