Columbia subject headings:
Poland--Relations--Prussia, East (Poland and Russia)
Prussia, East (Poland and Russia)--Relations--Poland.
Harvard subject headings:
Poland--Relations--Prussia, East (Poland and Russia)
Prussia, East (Poland and Russia)--Relations--Poland.
Princeton subject headings:
Kraków (Poland : Voivodeship)--History.
Mazury (Poland : Region)--History.
Warmia (Poland)--History.