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Subjects
Civil defense
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11
Radiation detection
3
Antichemical-protection service
2
Chemical decontamination
2
Civil defense at factories
2
Civil defense exercise
2
Contamination area
2
Imperialist aggression
2
Mushroom cloud
2
Personal antichemical-protection gear
2
Radio warning
2
Air raid
1
Air raid warning
1
Air-raid service
1
Arms race
1
Biological warfare
1
Black-out services
1
Chemical attack
1
Chemical reconnaissance
1
Civil defense command
1