Columbia subject headings:
Czechoslovakia--History--Intervention, 1968.
Hungary--History--Revolution, 1956.
International law and socialism.
Intervention (International law)
Soviet Union--Foreign relations--1953-1975.
Harvard subject headings:
Czechoslovakia--History--Intervention, 1968.
Hungary--History--Revolution, 1956
International law and socialism.
Intervention (International law)
Soviet Union--Foreign relations--1953-1975.
Princeton subject headings:
Czechoslovakia--History--Intervention, 1968.
Hungary--History--Revolution, 1956.
International law and socialism.
Intervention (International law)
Soviet Union--Foreign relations--1953-1975.