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Subjects
Civil defense
4
Gas mask
[remove]
4
Protective clothing
3
Personal antichemical-protection gear
2
Biological weapon
1
Chemical attack
1
Chemical decontamination
1
Decontamination
1
Decontamination of personal clothing
1
Decontamination of persons
1
Decontamination station
1
Epidemic
1
Evacuation
1
Food storage
1
Poison gases
1
Prevention
1
Public information work
1
Radioactive dust
1
Warning
1