Columbia subject headings:
Prussia, East (Poland and Russia)--History.
Prussia, West (Poland)--History.
Teutonic Knights--History.
Harvard subject headings:
Prussia, East (Poland and Russia)--History.
Prussia, West (Poland)--History.
Teutonic Knights--History.
Princeton subject headings:
Prussia, East (Poland and Russia)--History.
Prussia, West (Poland)--History.
Teutonic Knights--History.