Columbia subject headings:
Europe--Civilization--Congresses.
Europe--History--1492---Congresses.
Nationalism--Europe--Congresses.
Harvard subject headings:
Europe--Civilization--Congresses.
Europe--Civilization.
Europe--History--1492-
Europe--History--1492---Congresses.
Nationalism--Europe
Nationalism--Europe--Congresses
Princeton subject headings:
Europe--Civilization.
Europe--History--1492-
European federation.