Columbia subject headings:
Kętrzyński, Wojciech, 1838-1918.
Polish people--Prussia, East (Poland and Russia)--History.
Prussia, East (Poland and Russia)--History.
Harvard subject headings:
Kętrzyński, Wojciech, 1838-1918.
Polish people--Prussia, East (Poland and Russia)--History.
Prussia, East (Poland and Russia)--History.
Princeton subject headings: