Columbia subject headings:
Contingency (Philosophy)--Political aspects.
Democracy--Germany--20th century.
Germany--History--1918-1933.
Germany--Politics and government--1918-1933.
Political science--Germany--History--20th century.
Harvard subject headings:
Germany--History--1918-1933.
Germany--Politics and government--1918-1933
Political science--Germany--History--20th century
Princeton subject headings:
Germany--History--1918-1933.
Germany--Politics and government--1918-1933.
Political science--Germany--History--20th century.