Columbia subject headings:
Europe--Politics and government--1918-1945.
Germany--Foreign relations--1933-1945.
Hitler, Adolf, 1889-1945.
World War, 1939-1945--Causes.
World War, 1939-1945--Germany.
Harvard subject headings:
Princeton subject headings:
World War, 1939-1945--Causes.
World War, 1939-1945--History.