Columbia subject headings:
Harvard subject headings:
Germany--History--20th century
Germany--History--Revolution, 1918
Germany--History--Unification, 1990
Kristallnacht, 1938
Princeton subject headings:
Germany--History--20th century.
Germany--History--Revolution, 1918.
Germany--History--Unification, 1990.
Kristallnacht, 1938.