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Subjects
Civil defense
5
Imperialist aggression
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5
First World War
2
Second World War
2
Vietnam war
2
Air defense
1
Air raid warning
1
Bikini atoll nuclear tests
1
Chemical attack
1
Chemical weapon
1
Civil defense at factories
1
Civil defense exercise
1
Civil defense obligations
1
Construction of shelters
1
Contamination area
1
Damage zones
1
Decontamination of food
1
Education of youth
1
Escape route
1
Improvised shelters
1