Columbia subject headings:
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--Foreign relations--1848-1870.
Germany--Foreign relations--1871-1918.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--Foreign relations--1848-1870.
Germany--Foreign relations--1871-1918.