Columbia subject headings:
Europe, Eastern--Boundaries--Congresses.
Europe, Eastern--Historical geography--Congresses.
Nationalism--Europe, Eastern--History--Congresses.
Harvard subject headings:
Europe, Eastern--History--20th century--Congresses.
Historical geography--Europe, Eastern--Congresses.
Nationalism--Europe, Eastern--Congresses
Territory, National--Europe, Eastern--Congresses.
Princeton subject headings:
Europe, Eastern--Boundaries--Congresses.
Europe, Eastern--Historical geography--Congresses.
Nationalism--Europe, Eastern--History--Congresses.