Columbia subject headings:
Europe--Politics and government--1789-1900.
Germany--History--William I, 1871-1888.
Prussia (Germany)--History--William I, 1861-1888.
Prussia (Germany)--Politics and government--1815-1870.
Harvard subject headings:
Europe--Politics and government--1789-1900.
Germany--History--William I, 1871-1888.
Personal correspondence.
Prussia (Germany)--History--William I, 1861-1888.
Prussia (Germany)--History--William I, 1871-1888.
Prussia (Germany)--Politics and government--1815-1870.
Princeton subject headings:
Europe--Politics and government--1789-1900.
Germany--History--William I, 1871-1888.
Prussia (Germany)--History--William I, 1871-1888.
Prussia (Germany)--Politics and government--1815-1870.