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Subjects
Civil defense
6
Imperialist aggression
3
Chemical attack
2
First World War
2
Poison gases
2
Second World War
2
Vietnam war
2
Air defense
1
Air raid warning
1
Antichemical-protection service
1
Bikini atoll nuclear tests
1
Chemical decontamination
1
Chemical weapon
1
Civil defense obligations
1
Contamination area
1
Damage zones
1
Decontamination of food
1
Engineering rescue services
1
Gas mask
1
Korean war
1