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Subjects
Civil defense
43
History
11
Military
11
Agriculture
9
Civil defense exercise
8
Education
8
Warsaw Pact
8
Council for Mutual Economic Assistance
7
Housing
7
Industry
7
Economy
6
Imperialist aggression
6
Biography
5
Civil defense at factories
5
Contamination area
5
Engineering rescue services
5
Evacuation
5
Radiation detection
5
Transportation
5
Antichemical-protection service
4