Columbia subject headings:
Communism and philosophy--Soviet Union.
Perestroĭka.
Soviet Union--Economic policy--1986-1991.
Soviet Union--Politics and government--1985-1991.
Harvard subject headings:
Communism--Philosophy--History--20th century.
Philosophy--Soviet Union--History--20th century.
Princeton subject headings:
Perestroĭka.
Philosophy, Marxist--Soviet Union.
Philosophy, Russian--20th century.