Columbia subject headings:
Teutonic Knights--History--Congresses.
Teutonic Knights--History--Study and teaching--Germany--Congresses.
Teutonic Knights--History--Study and teaching--Poland--Congresses.
Harvard subject headings:
Poland--Foreign relations--Teutonic Knights.
Poland--Foreign relations--To 1572
Prussia, East (Poland and Russia)--History.
Teutonic Knights--Foreign relations--Poland.
Teutonic Knights--History--Congresses.
Teutonic Knights--History--Study and teaching--Germany--Congresses.
Teutonic Knights--History--Study and teaching--Poland--Congresses.
Princeton subject headings: