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Subjects
Civil defense
10
History
6
Military
5
Decontamination of food
4
Education
4
Football
4
Sports
4
Agriculture
2
Chemical decontamination
2
Decontamination
2
Evacuation
2
Food storage
2
Industry
2
Traffic control
2
Antichemical-protection service
1
Arms race
1
Biological warfare
1
Camouflaging
1
Civil defense at factories
1
Civil defense command
1