Columbia subject headings:
Germany--Foreign relations--Soviet Union.
Germany--History--Allied occupation, 1918-1930.
Soviet Union--Foreign relations--Germany.
Harvard subject headings:
Germany--Foreign relations--Soviet Union.
Germany--History--Allied occupation, 1918-1930.
Soviet Union--Foreign relations--Germany.
Princeton subject headings:
Germany--Foreign relations--Soviet Union.
Germany--History--Allied occupation, 1918-1930.
Soviet Union--Foreign relations--Germany.