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Subjects
Civil defense
6
Imperialist aggression
[remove]
6
Civil defense exercise
2
Damage zones
2
First World War
2
Peace movement
2
Second World War
2
Vietnam war
2
Air defense
1
Air raid warning
1
Arms race
1
Bikini atoll nuclear tests
1
Chemical attack
1
Chemical weapon
1
Civil defense at factories
1
Civil defense obligations
1
Construction of shelters
1
Contamination area
1
Decontamination of food
1
Education of youth
1