Columbia subject headings:
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--History--1848-1870--Sources.
Germany--Politics and government--1848-1870--Sources.
Prussia (Germany)--Politics and government--1815-1870--Sources.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--Politics and government--1848-1870--Sources.
Germany--Politics and government--1871-1918--Sources.