Columbia subject headings:
Harvard subject headings:
Poland--Relations--Germany--Prussia--Congresses.
Pomerelia (Poland)--History--19th century--Congresses.
Poznań Region (Poland)--History--19th century--Congresses.
Prussia (Germany)--History--19th century--Congresses.
Prussia (Germany)--Relations--Poland--Congresses.
Princeton subject headings:
Poland--Relations--Prussia (Germany)--Congresses.
Pomerelia (Poland)--History--19th century--Congresses.
Poznań Region (Poland)--History--19th century--Congresses.
Prussia (Germany)--History--19th century--Congresses.
Prussia (Germany)--Relations--Poland--Congresses.