Columbia subject headings:
Gambling--Italy--History--Congresses.
Gambling--Social aspects--Italy--Congresses.
Harvard subject headings:
Gambling--Italy--History--Congresses.
Gambling--Italy--Social aspects--Congresses.
Gambling--Social aspects--Italy--Congresses.
Princeton subject headings:
Gambling--Italy--History--Congresses.
Gambling--Italy--Social aspects--Congresses.