Columbia subject headings:
Communism--Soviet Union.
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Politics and government--1917-1936.
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--Politics and government--1917-1936.