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Subjects
Civil defense
13
Civil defense at factories
4
Civil defense exercise
3
Imperialist aggression
3
War production plants
3
Air raid warning
2
Chemical attack
2
Civil defense obligations
2
Evacuation
2
First World War
2
Mobilization
2
Poison gases
2
Public information work
2
Search and rescue of the injured
2
Second World War
2
Switch to war production
2
Traffic control
2
Vietnam war
2
Air defense
1
Air raid
1