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Subjects
Civil defense
12
History
9
Military
7
Decontamination of food
5
Education
4
Football
4
Sports
4
Agriculture
3
Arts
2
Biography
2
Chemical decontamination
2
Decontamination
2
Evacuation
2
Food storage
2
Industry
2
Traffic control
2
World War II
2
Animal and plant protection reconnaissance
1
Antichemical-protection service
1
Arms race
1