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Subject
- Civil defense40
- History12
- Emergency management7
- Air defenses5
- Disaster relief5
- Law and legislation5
- World War, 1939-19455
- Air raid shelters4
- National security4
- Military policy3
- Soldiers3
- Armed Forces2
- Bunkers (Fortification)2
- Germany2
- Legal status, laws, etc2
- Military law2
- Nonviolence2
- Adjustment (Psychology)1
- Aerial operations1
- Air warfare (International law)1