Columbia subject headings:
Neutrality--Europe--Congresses.
Nonalignment--Europe--Congresses.
Harvard subject headings:
Neutrality--Congresses.
Neutrality--Europe--Congresses.
Nonalignment--Europe--Congresses.
World politics--1945-1989--Congresses
Princeton subject headings:
Neutrality--Europe--Congresses.
Nonalignment--Europe--Congresses.