Title: Borders, Fences and Walls
Subjects: National security, Emigration and immigration, government policy, Border security, Case studies, Emigration and immigration, Government policy, Sécurité frontalière, Études de cas, Émigration et immigration, Politique gouvernementale, HISTORY, Military, Other, TECHNOLOGY & ENGINEERING, Military Science, Grenze, Grenzpolitik, Grenzschutz, Zaun