Columbia subject headings:
Prussia (Germany)--Economic conditions.
Prussia (Germany)--History.
Prussia (Germany)--Politics and government.
Prussia (Germany)--Social life and customs.
Harvard subject headings:
Prussia (Germany)--Economic conditions.
Prussia (Germany)--History.
Prussia (Germany)--Politics and government.
Prussia (Germany)--Social life and customs.
Princeton subject headings:
Prussia (Germany)--Economic conditions.
Prussia (Germany)--History.
Prussia (Germany)--Politics and government.
Prussia (Germany)--Social life and customs.