Columbia subject headings:
Intergovernmental cooperation--United States.
National Commission on Terrorist Attacks upon the United States.
National security--United States.
September 11 Terrorist Attacks, 2001.
Terrorism--Government policy--United States.
Terrorism--United States--Prevention.
Harvard subject headings:
Intergovernmental cooperation--United States.
National Commission on Terrorist Attacks upon the United States.
National security--United States
September 11 Terrorist Attacks, 2001.
Terrorism--Government policy--United States
Terrorism--United States--Prevention
Princeton subject headings:
Intergovernmental cooperation--United States.
National Commission on Terrorist Attacks upon the United States.
National security--United States.
September 11 Terrorist Attacks, 2001.
Terrorism--Government policy--United States.
Terrorism--United States--Prevention.