Columbia subject headings:
Czechoslovakia--History--Intervention, 1968--Bibliography.
Czechoslovakia--Politics and government--1945-1992--Bibliography.
Harvard subject headings:
Czechoslovakia--History--Intervention, 1968--Bibliography.
Czechoslovakia--Politics and government--1945-1992--Bibliography.
Princeton subject headings:
Czechoslovakia--History--Intervention, 1968--Bibliography.
Czechoslovakia--Politics and government--1945-1992--Bibliography.