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Subjects
Civil defense
13
Engineering rescue services
3
NBC (nuclear, biological, chemical) special services
3
Warning
3
Antichemical-protection service
2
Civil defense command
2
Contamination area
2
Evacuation
2
Food storage
2
Imperialist aggression
2
Public information work
2
Second World War
2
Simulation
2
Traffic
2
Transportation
2
Water supply
2
Air defense
1
Air raid warning
1
Assembly area
1
Bikini atoll nuclear tests
1