Columbia subject headings:
Czechoslovakia--Politics and government--1968-1989.
Perestroĭka.
Soviet Union--Politics and government--1985-1991.
Harvard subject headings:
Czechoslovakia--Politics and government--1968-1989.
Perestroĭka.
Princeton subject headings:
Czechoslovakia--Politics and government--1968-1989.
Perestroĭka.
Soviet Union--Politics and government--1985-1991.