Columbia subject headings:
Terrorism--Government policy--United States.
Terrorism--Prevention--International cooperation.
Terrorism--United States--Prevention.
Harvard subject headings:
Terrorism--Government policy--United States
Terrorism--Prevention--International cooperation
Terrorism--United States--Prevention
Terrorist safe havens.
Princeton subject headings:
Terrorism--Government policy--United States.
Terrorism--Prevention--International cooperation.
Terrorism--United States--Prevention.