Columbia subject headings:
Harvard subject headings:
Communism--Europe
Communism--Soviet Union
Germany--Politics and government--20th century
National socialism.
Soviet Union--Politics and government.
World politics--20th century
Princeton subject headings:
Communism--Germany--History.
Germany--Foreign relations--Soviet Union.
Germany--History--1918-1933.
Germany--History--1933-1945.
National socialism.
Soviet Union--Foreign relations--Germany.
Soviet Union--History.