Columbia subject headings:
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--Politics and government--1789-1900
Social security--Germany--History
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Germany--Politics and government--1789-1900.
Social security--Germany--History.
Sozialdemokratische Partei Deutschlands--History.