Columbia subject headings:
Communism--Soviet Union.
Soviet Union--Economic conditions.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--Social conditions.
Harvard subject headings:
Communism--Soviet Union
Soviet Union--Economic conditions--1917-1945.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--Social conditions--1917-1945.
Princeton subject headings: