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Subjects
Civil defense
3
Imperialist aggression
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3
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
Damage zones
1
Decontamination of food
1
Korean war
1
Poison gases
1
Warning
1
Warsaw Pact Treaty
1
Weapons of mass destruction
1