Columbia subject headings:
Intergovernmental cooperation--United States.
National security--United States--Information services.
Terrorism--Prevention--Government policy--United States.
Terrorism--United States--Prevention--Information services.
Harvard subject headings:
Intergovernmental cooperation--United States.
National security--United States--Information services.
Terrorism--Prevention--Government policy--United States
Terrorism--United States--Prevention--Information services.
Princeton subject headings:
Intergovernmental cooperation--United States.
National security--United States--Information services.
Terrorism--Prevention--Government policy--United States.
Terrorism--United States--Prevention--Information services.