Columbia subject headings:
Neutrality--Europe--Congresses.
Neutrality--Europe.
Nonalignment--Europe--Congresses.
Nonalignment--Europe.
Security, International--Congresses.
Harvard subject headings:
Europe--Neutrality.
Europe--Nonalignment.
Neutrality--Europe--Congresses.
Nonalignment--Europe--Congresses.
Security, International--Congresses
Princeton subject headings:
Europe--Politics and government--1945-
Neutrality--Europe.