Columbia subject headings:
Italy--Antiquities--Congresses.
Italy--Boundaries--History--Congresses.
Italy--Historical geography--Congresses.
Italy--History--476-1268--Congresses.
Harvard subject headings:
Italy--Antiquities--Congresses.
Italy--Boundaries--History--Congresses.
Italy--Historical geography--Congresses.
Italy--History--476-1268--Congresses.
Princeton subject headings:
Italy--Antiquities--Congresses.
Italy--Boundaries--History--Congresses.
Italy--Historical geography--Congresses.
Italy--History--476-1268--Congresses.