Columbia subject headings:
Harvard subject headings:
Germany--History--1871-1918.
Socialism--Germany
World War, 1914-1918--Germany.
Princeton subject headings:
Germany--History--1871-1918.
Socialism--Germany.
War and socialism--Europe--History--20th century.
World War, 1914-1918--Germany.
World War, 1914-1918--Protest movements--Europe.