Columbia subject headings:
Soviet Union--Politics and government--1953-1985.
Soviet Union--Politics and government--1985-1991.
Harvard subject headings:
Soviet Union--Politics and government--1953-1985.
Soviet Union--Politics and government--1985-1991.
Princeton subject headings:
Soviet Union--Politics and government--1953-1985.
Soviet Union--Politics and government--1985-1991.