Columbia subject headings:
Harvard subject headings:
Bismarck, Otto, Fürst von, 1815-1898--Congresses.
Europe--Politics and government--1848-1871--Congresses.
Europe--Politics and government--1871-1918--Congresses.
Princeton subject headings:
Bismarck, Otto, Fürst von, 1815-1898--Congresses.
Europe--Politics and government--1848-1871--Congresses.
Europe--Politics and government--1871-1918--Congresses.