Columbia subject headings:
Czechoslovakia--Relations--Hungary.
Hungary--Relations--Czechoslovakia.
Slovakia--Relations--Hungary.
Harvard subject headings:
Czechoslovakia--Relations--Hungary.
Hungary--Relations--Czechoslovakia.
Slovakia--Relations--Hungary.
Princeton subject headings:
Czechoslovakia--Foreign relations--Hungary.
Hungary--Foreign relations--Czechoslovakia.
Hungary--Foreign relations--Slovakia.
Slovakia--Foreign relations--Hungary.