Columbia subject headings:
Harvard subject headings:
Communism--History--20th century
Fascism--History
National socialism.
World War, 1939-1945--Causes.
Princeton subject headings:
Communism--History--20th century.
Fascism--History--20th century.
Fascism.
National socialism--History--20th century.
National socialism.
World War, 1939-1945--Causes.