Columbia subject headings:
Europe--History--1492-
History, Modern--Miscellanea.
Harvard subject headings:
Europe, Central--History--Congresses.
Princeton subject headings:
Europe, Central--Civilization--Congresses.
Europe, Central--Civilization--Study and teaching--Congresses.
Europe, Central--History--Congresses.
Europe, Central--History--Study and teaching--Congresses.
Europe--History--1492---Congresses.