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Subjects
Civil defense
11
Civil defense command
3
Radio warning
3
Civil defense at factories
2
Engineering rescue services
2
Escape route
2
First aid
2
Imperialist aggression
2
Improvised shelters
2
Simulation
2
Training coordination
2
Agriculture
1
Air defense
1
Air raid warning
1
Air-raid service
1
Antichemical-protection service
1
Assembly area
1
Ballet
1
Bikini atoll nuclear tests
1
Biological warfare
1