Columbia subject headings:
Harvard subject headings:
Czechoslovakia--History--Intervention, 1968.
Czechoslovakia--Politics and government--1968-1989.
Czechoslovakia--Politics and government--1989-
Prague (Czech Republic)--History.
Princeton subject headings:
Czechoslovakia--History--Intervention, 1968.
Czechoslovakia--Politics and government--1968-1989.
Czechoslovakia--Politics and government--1989-1992.
Prague (Czech Republic)--History.