Columbia subject headings:
Europe, Eastern--History--Congresses.
Europe--History--Congresses.
Harvard subject headings:
Europe--Civilization--Congresses.
Europe--Politics and government--1492-1648--Congresses.
Europe--Politics and government--17th century--Congresses.
Europe--Politics and government--18th century--Congresses.
Europe--Politics and government--476-1492--Congresses.
Poland--Civilization--To 1795--Congresses.
Poland--Politics and government--1572-1763--Congresses.
Poland--Politics and government--To 1572--Congresses.
Princeton subject headings:
Europe, Eastern--History--Congresses.
Europe--History--Congresses.