Columbia subject headings:
Biological warfare--Government policy--United States.
Biological weapons--Government policy--United States.
National security--United States.
Terrorism--Government policy--United States.
Toxins--Government policy--United States.
Harvard subject headings:
Biological warfare--Government policy--United States.
Biological weapons--Government policy--United States.
National security--United States
Terrorism--Government policy--United States
Toxins--Government policy--United States.
Princeton subject headings:
Biological warfare--Government policy--United States.
Biological weapons--Government policy--United States.
National security--United States.
Terrorism--Government policy--United States.
Toxins--Government policy--United States.