Columbia subject headings:
Harvard subject headings:
Berlin Wall, Berlin, Germany, 1961-1989
Germany--History--1933-1945.
Germany--History--20th century.
Germany--History--Revolution, 1918.
Princeton subject headings:
Germany--History--Beer Hall Putsch, 1923.
Germany--History--Revolution, 1918.
Germany--History--Unification, 1990.
Kristallnacht, 1938.