Columbia subject headings:
Germany--Foreign relations--Poland--Congresses.
Poland--Boundaries--History.
Poland--Foreign relations--Germany--Congresses.
Prussia (Germany)--Foreign relations--Poland--Congresses.
Harvard subject headings:
Germany--Relations--Poland--Congresses.
Poland--Relations--Germany--Congresses
Poland--Relations--Germany--Prussia--Congresses.
Polish question--Congresses.
Prussia (Germany)--Relations--Poland--Congresses.
Princeton subject headings:
Germany--Foreign relations--Poland--Congresses.
Poland--Boundaries--History.
Poland--Foreign relations--Germany--Congresses.
Prussia (Germany)--Foreign relations--Poland--Congresses.