Columbia subject headings:
Germany--Foreign relations--1918-1933.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Germany.
Harvard subject headings:
Germany--Foreign relations--1918-1933.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Germany.
Princeton subject headings:
Germany--Foreign relations--1918-1933.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Germany.