Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--History
Europe, Eastern--Politics and government--20th century.
Socialism--Soviet Union--History
Soviet Union--History.
Soviet Union--Politics and government.
Princeton subject headings:
Communism--Soviet Union--History.
Europe, Eastern--Politics and government--20th century.
Socialism--Soviet Union--History.
Soviet Union--History.
Soviet Union--Politics and government.