Columbia subject headings:
Czechoslovakia--History--Intervention, 1968--Foreign public opinion.
Czechoslovakia--History--Intervention, 1968--Influence.
Czechoslovakia--History--Intervention, 1968.
Harvard subject headings:
Czechoslovakia--History--Intervention, 1968
Czechoslovakia--History--Intervention, 1968--Foreign public opinion, European.
Czechoslovakia--History--Intervention, 1968--Influence.
Princeton subject headings:
Czechoslovakia--History--Intervention, 1968--Foreign public opinion.
Czechoslovakia--History--Intervention, 1968--Influence.
Czechoslovakia--History--Intervention, 1968.