Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Politics and government--1917-1936.
Princeton subject headings:
Communism--Soviet Union.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy.
Soviet Union--History--Revolution, 1917-1921.
Soviet Union--Politics and government--1917-1936.