Columbia subject headings:
Culture--Congresses.
European federation--Congresses.
Nationalism--Europe--History--20th century--Congresses.
Harvard subject headings:
Europe--Civilization--1945---Congresses.
Europe--Politics and government--1989---Congresses.
European federation--Congresses
Nationalism--Europe--Congresses
Regionalism--Europe--Congresses
Princeton subject headings:
Culture--Congresses.
European federation--Congresses.
Nationalism--Europe--History--20th century--Congresses.