Columbia subject headings:
Nuclear-weapon-free zones--Europe, Central--Congresses.
Nuclear-weapon-free zones--Europe--Congresses.
Nuclear-weapon-free zones--Norway--Congresses.
Harvard subject headings:
Nuclear-weapon-free zones--Europe, Central--Congresses.
Nuclear-weapon-free zones--Europe--Congresses.
Nuclear-weapon-free zones--Norway--Congresses.
Princeton subject headings:
Nuclear-weapon-free zones--Europe, Central--Congresses.
Nuclear-weapon-free zones--Europe--Congresses.
Nuclear-weapon-free zones--Norway--Congresses.