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Subjects
Civil defense
17
Civil defense at factories
4
Civil defense exercise
4
Imperialist aggression
4
War production plants
3
Air raid warning
2
Antichemical-protection service
2
Chemical attack
2
Civil defense command
2
Civil defense obligations
2
Damage zones
2
Engineering rescue services
2
Evacuation
2
First World War
2
Mobilization
2
NBC (nuclear, biological, chemical) special services
2
Peace movement
2
Poison gases
2
Public information work
2
Radiation detection
2