Columbia subject headings:
Harvard subject headings:
Diplomacy--History--Congresses.
Europe--Foreign relations--Congresses.
Europe--History--1492---Congresses.
Europe--Politics and government--Congresses.
World politics--Congresses
Princeton subject headings:
Diplomacy--History--Congresses.
Europe--Foreign relations--Congresses.
Europe--History--1492---Congresses.
Europe--Politics and government--Congresses.
World politics--Congresses.