Columbia subject headings:
Harvard subject headings:
Czechoslovakia--Politics and government--1968-1989.
Czechoslovakia--Politics and government--1989-
Dubček, Alexander, 1921-
Heads of state--Czechoslovakia--Biography.
Princeton subject headings:
Czechoslovakia--Politics and government--1968-1989.
Czechoslovakia--Politics and government--1989-1992.
Dubček, Alexander, 1921-1992.
Heads of state--Czechoslovakia--Biography.