Columbia subject headings:
Harvard subject headings:
Austria--Foreign relations--1955---Congresses.
Austria--Foreign relations--Hungary--Congresses.
Hungary--Foreign relations--Austria--Congresses.
Hungary--History--Revolution, 1956--Congresses.
Neutrality--Austria--Congresses.
Princeton subject headings:
Austria--Foreign relations--1955---Congresses.
Hungary--History--Revolution, 1956--Congresses.
Neutrality--Austria--Congresses.