Columbia subject headings:
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Demographic transition--Germany--History--19th century.
Germany--Population--History--19th century.
Germany--Social conditions--19th century.
Social security--Germany--History--19th century.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898.
Demographic transition--Germany--History--19th century.
Germany--Population--History--19th century.
Germany--Social conditions--19th century.
Social security--Germany--History--19th century.