Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Boundaries--History--Congresses.
Europe, Eastern--Boundaries--History.
Europe, Eastern--Historical geography--Congresses.
Europe, Eastern--Historical geography.
Italy--Boundaries--History--Congresses.
Italy--Boundaries--History.
Princeton subject headings:
Europe--Boundaries--History.
Europe--Historical geography.
Italy--Boundaries--History.