Columbia subject headings:
Civil defense--United States--Planning.
Disaster medicine--United States--Planning.
Emergency management--United States--Planning.
Terrorism--United States--Prevention.
United States--Defenses.
Harvard subject headings:
Bioterrorism--Government policy--United States.
National security--United States
Risk assessment--United States.
Weapons of mass destruction
Princeton subject headings:
Bioterrorism--Government policy--United States.
National security--United States.
Risk assessment--United States.
Weapons of mass destruction.