Columbia subject headings:
Harvard subject headings:
Prussia (Germany)--Historiography--Congresses.
Prussia, East (Poland and Russia)--Historiography--Congresses.
Prusy Królewskie (Poland)--Historiography--Congresses.
Teutonic Knights--Prussia, East (Poland and Russia)--Historiography--Congresses.
Princeton subject headings:
Prussia (Germany)--Historiography--Congresses.
Prussia, East (Poland and Russia)--Historiography--Congresses.
Prusy Królewskie (Poland)--Historiography--Congresses.
Teutonic Knights--Prussia, East (Poland and Russia)--Historiography--Congresses.