Columbia subject headings:
Harvard subject headings:
Europe--History--1492-1648--Congresses.
Germany--History--1618-1648--Congresses.
Peace of Westphalia--Congresses.
Thirty Years' War, 1618-1648--Diplomatic history--Congresses.
Thirty Years' War, 1618-1648--Peace--Congresses.
Princeton subject headings:
Europe--Politics and government--Congresses.
Peace of Westphalia--Congresses.
Peace--History--Congresses.