Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--History--Congresses.
Democratization--Europe, Eastern--Congresses.
Europe, Central--Civilization--20th century--Congresses.
Europe, Central--History--Congresses.
Europe, Central--Social conditions--Congresses.
Europe, Eastern--Civilization--20th century--Congresses.
Europe, Eastern--History--20th century--Congresses.
Europe, Eastern--History--Congresses.
Europe, Eastern--Politics and government--20th century--Congresses.
Europe, Eastern--Social conditions--Congresses.
Princeton subject headings:
Democratization--Europe, Eastern--Congresses.
Europe, Eastern--History--20th century--Congresses.
Europe, Eastern--Politics and government--20th century--Congresses.