Columbia subject headings:
Harvard subject headings:
Poland--Relations--Germany--Prussia.
Press and politics--Germany--Prussia.
Press--Poland--Poznań--History--19th century.
Prussia (Germany)--Politics and government--1870-1947.
Prussia (Germany)--Relations--Poland.
Public opinion--Poland--History--19th century.
Princeton subject headings:
Poland--Foreign relations--Germany--Prussia.
Press--Poland--Poznań--History--19th century.
Prussia (Germany)--Foreign relations--Poland.