Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--History--Congresses.
Balkan Peninsula--Relations--Italy--Venice--Congresses.
Venice (Italy)--History--Congresses.
Venice (Italy)--Relations--Balkan Peninsula--Congresses.
Princeton subject headings:
Balkan Peninsula--History--Congresses.
Balkan Peninsula--Relations--Italy--Venice--Congresses.
Venice (Italy)--History--Congresses.
Venice (Italy)--Relations--Balkan Peninsula--Congresses.