Columbia subject headings:
Germany--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Germany--Sources.
World War, 1939-1945--Causes.
World War, 1939-1945--Diplomatic history--Sources.
Harvard subject headings:
Germany--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Germany--Sources.
World War, 1939-1945--Causes.
World War, 1939-1945--Diplomatic history--Sources.
Princeton subject headings:
Germany--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Germany--Sources.
World War, 1939-1945--Causes.
World War, 1939-1945--Diplomatic history--Sources.