Columbia subject headings:
Communism--Soviet Union.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.
Harvard subject headings:
Communism--Soviet Union
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.
Princeton subject headings:
Communism--Soviet Union.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.