Columbia subject headings:
Europe, Northern--Defenses.
North Atlantic Treaty Organization--Europe, Northern.
North Atlantic Treaty Organization--Scandinavia.
Scandinavia--Defenses.
Harvard subject headings:
Europe, Northern--Defenses.
North Atlantic Treaty Organization--Europe, Northern.
North Atlantic Treaty Organization--Scandinavia.
Scandinavia--Defenses.
Princeton subject headings:
Europe, Northern--Defenses.
North Atlantic Treaty Organization--Europe, Northern.
North Atlantic Treaty Organization--Scandinavia.
Scandinavia--Defenses.