Columbia subject headings:
Container ships--United States.
Harbors--Security measures--United States.
National security--United States.
Nuclear terrorism--United States--Prevention.
Shipping--Security measures--United States.
Harvard subject headings:
Container ships--United States.
Harbors--Security measures--United States
National security--United States
Nuclear terrorism--United States--Prevention.
Shipping--Security measures--United States
Princeton subject headings:
Container ships--United States.
Harbors--Security measures--United States.
National security--United States.
Nuclear terrorism--United States--Prevention.
Shipping--Security measures--United States.