"POLITICAL SCIENCE / Terrorism" . . "Terrorism Prevention" . . "Terrorism Prevention." . "Terrorism United States Prevention." . . "National security United States." . . "National security" . . "National security." . "United States" . . "United States." . . . . . . . . . . "Electronic books" . . . . . . "Maintaining homeland security" . "Maintaining homeland security"@en . . . . . . . . . "Livres électroniques" . . . . "United States. Department of Homeland Security" . . "United States. Department of Homeland Security." .