Columbia subject headings:
Harvard subject headings:
Czechoslovakia--Politics and government--1968-1989.
Czechoslovakia--Politics and government--1989-
Opposition (Political science)--Czechoslovakia--History--20th century.
Opposition (Political science)--Soviet Union--History--20th century.
Soviet Union--Politics and government--1953-1985.
Soviet Union--Politics and government--1985-1991.
Princeton subject headings:
Czechoslovakia--History--Intervention, 1968.
Czechoslovakia--Politics and government.
Opposition (Political science)--Czechoslovakia--History.
Opposition (Political science)--Soviet Union--History.
Soviet Union--Politics and government.