Columbia subject headings:
Terrorism--United States--Prevention.
Terrorists--Government policy--United States.
Terrorists--United States--Identification.
War on Terrorism, 2001-
Harvard subject headings:
Terrorism--United States--Prevention
Terrorists--Government policy--United States.
Terrorists--United States--Identification.
War on Terrorism, 2001-2009
Princeton subject headings:
Terrorism--United States--Prevention.
Terrorists--Government policy--United States.
Terrorists--United States--Identification.
War on Terrorism, 2001-2009.