Columbia subject headings:
Harvard subject headings:
Germany--History--1871-1918.
Monarchy--Germany--History--19th century.
Monarchy--Germany--History--20th century.
World War, 1914-1918--Germany.
Princeton subject headings:
Germany--History--1871-1918.
Monarchy--Germany--History--19th century.
Monarchy--Germany--History--20th century.
World War, 1914-1918--Germany.