Columbia subject headings:
Germany--Relations--Soviet Union.
Poland--History.
Soviet Union--Relations--Germany.
World War, 1939-1945--Causes.
World War, 1939-1945--Poland.
Harvard subject headings:
Germany--Relations--Soviet Union.
Poland--History
Soviet Union--Relations--Germany.
World War, 1939-1945--Causes.
World War, 1939-1945--Poland.
Princeton subject headings:
Germany--Relations--Soviet Union.
Poland--History.
Soviet Union--Relations--Germany.
World War, 1939-1945--Causes.
World War, 1939-1945--Poland.