Columbia subject headings:
Pomerania (Poland and Germany)--History--Congresses.
Prussia, East (Poland and Russia)--History--Congresses.
Teutonic Knights--History--Congresses.
Harvard subject headings:
Pomerania (Poland and Germany)--History--Congresses.
Prussia, East (Poland and Russia)--History--Congresses.
Teutonic Knights--History--Congresses.
Princeton subject headings:
Prussia, East (Poland and Russia)--History.
Prussia, West (Poland)--History.
Prussians (Baltic people)--History.