Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--To 1517--Congresses.
Poland--Politics and government--To 1572--Congresses.
Political customs and rites--Germany--History--Congresses.
Political customs and rites--Poland--History--Congresses.
Political science--Germany--Decision making--History--Congresses.
Political science--Poland--Decision making--History--Congresses.
Princeton subject headings:
Germany--Politics and government--To 1517--Congresses.
Poland--Politics and government--To 1572--Congresses.
Political customs and rites--Germany--History--Congresses.
Political customs and rites--Poland--History--Congresses.
Political science--Germany--Decision making--History--Congresses.
Political science--Poland--Decision making--History--Congresses.