Columbia subject headings:
Communication of technical information--United States.
National security--United States--Information services.
Terrorism--United States--Prevention--Information services.
United States. Office of Homeland Security--Information resources management.
Harvard subject headings:
Communication of technical information--United States.
National security--United States--Information services.
Terrorism--United States--Prevention--Information services.
United States. Office of Homeland Security--Information resources management.
Princeton subject headings:
Communication of technical information--United States.
National security--United States--Information services.
Terrorism--United States--Prevention--Information services.
United States. Office of Homeland Security--Information resources management.