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- Civil defense747
- United States64
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- Safety measures41
- World War, 1939-194533
- National security30
- Civil Defense28
- Study and teaching28
- Terrorism26
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- Law and legislation24
- Prevention23
- Civil defense warning systems20
- Nuclear bomb shelters17
- Air defenses14
- Appropriations and expenditures14
- Government policy14
- Armed Forces13
- Defenses13