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Subjects
Civil defense
4
Radio warning
4
Agriculture
1
Air raid warning
1
Air-raid service
1
Black-out services
1
Civil defense at factories
1
Civil defense command
1
Evacuation and refugee shelter services
1
Food storage
1
History
1
Improvised shelters
1
Military
1
Political tale
1
Public information work
1
Radio
1
Reception center for evacuees
1
Signal operator
1
Siren
1
Telecommunication
1