Columbia subject headings:
Germany--History.
Harvard subject headings:
Germany--History--1789-1900.
Germany--History--1918-1933.
Germany--History--1933-1945.
Germany--History--1945-1990.
Germany--History--William II, 1888-1918.
Germany--History.
Princeton subject headings:
Germany--History--1789-1900.
Germany--History--20th century.