Columbia subject headings:
International relations--History.
Soviet Union--Foreign relations--1917-1945.
World politics--1900-1945.
Harvard subject headings:
International relations--History
Soviet Union--Foreign relations--1917-1945.
World politics--1900-1945
Princeton subject headings:
International relations--History.
Soviet Union--Foreign relations--1917-1945.
World politics--1900-1945.