Columbia subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Social conditions.
Harvard subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Social conditions--1917-1945.
Princeton subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Social conditions--1917-.