Columbia subject headings:
Harvard subject headings:
Europe--Politics and government--1918-1945.
World War, 1939-1945--Causes.
World War, 1939-1945.
World politics--20th century
Princeton subject headings:
Europe--Politics and government--1918-1945.
World War, 1939-1945--Causes.
World War, 1939-1945.
World politics--20th century.