Columbia subject headings:
North Atlantic Treaty Organization--Congresses.
North Atlantic Treaty Organization--Reorganization--Congresses.
Security, International--Congresses.
World politics--21st century--Congresses.
Harvard subject headings:
North Atlantic Treaty Organization--Congresses.
North Atlantic Treaty Organization--Reorganization--Congresses.
Security, International--Congresses
World politics--21st century--Congresses
Princeton subject headings: