Columbia subject headings:
Harvard subject headings:
Public interest--Europe--History--Congresses.
Public interest--Italy--History--Congresses.
Public opinion--Europe--History--Congresses.
Public opinion--Italy--History--Congresses.
Princeton subject headings:
Public interest--Europe--History--Congresses.
Public interest--Italy--History--Congresses.
Public opinion--Europe--History--Congresses.
Public opinion--Italy--History--Congresses.