Columbia subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
France--Foreign relations--Germany.
Franco-Prussian War, 1870-1871--Causes.
Germany--Foreign relations--France.
Germany--Foreign relations--Spain.
Hohenzollern, Leopold, Fürst von, 1835-1905.
Spain--Foreign relations--Germany.
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
France--Foreign relations--Germany.
Franco-Prussian War, 1870-1871--Causes
Germany--Foreign relations--France.
Germany--Foreign relations--Spain.
Hohenzollern, Leopold, Fürst von, 1835-1905.
Spain--Foreign relations--Germany.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--Foreign relations--1871-1918.
Germany--History--1789-1900--Sources.
Prussia (Germany)--History--1815-1870--Sources.
Prussia (Germany)--History--1870---Sources.