Columbia subject headings:
September 11 Terrorist Attacks, 2001.
Symbolism in politics.
Terrorism--Psychological aspects.
Terrorism.
Harvard subject headings:
September 11 Terrorist Attacks, 2001
Symbolism in politics.
Terrorism
Terrorism--Psychological aspects
Princeton subject headings:
September 11 Terrorist Attacks, 2001.
Symbolism in politics.
Terrorism--Psychological aspects.
Terrorism.