Columbia subject headings:
Harvard subject headings:
Soviet Union--Foreign relations--1917-1945.
Soviet Union--History--Allied intervention, 1918-1920.
Soviet Union--Military policy.
World politics--1900-1945
Princeton subject headings:
Soviet Union--Foreign relations--1917-1945.
Soviet Union--History--Allied intervention, 1918-1920.
Soviet Union--Military policy.
World politics--1900-1945.