Columbia subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Schleswig-Holstein question.
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Schleswig-Holstein question.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Schleswig-Holstein question.