Columbia subject headings:
Harvard subject headings:
Internal security--United States
Napolitano, Janet
National security--United States
Terrorism--United States--Prevention
United States--Politics and government--1989-
United States. Department of Homeland Security.
Princeton subject headings:
Internal security--United States.
Napolitano, Janet.
National security--United States.
Terrorism--United States--Prevention.
United States--Politics and government--1989-
United States. Department of Homeland Security