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