Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--Soviet Union--Congresses.
Germany. Treaties, etc. 1939 August 23--Congresses.
Soviet Union--Foreign relations--Germany--Congresses.
Princeton subject headings:
Germany--Foreign relations--Soviet Union--Congresses.
Germany. Treaties, etc. 1939 August 23--Congresses.
Soviet Union--Foreign relations--Germany--Congresses.