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Subjects
Civil defense
11
Warsaw Pact
5
Communism
4
History
4
Leisure
4
Agriculture
3
Economy
3
Housing
3
Hydro plant
3
Industry
3
Labor movement
3
Military
3
North Atlantic Treaty Organization
3
Radiation detection
3
WWII
3
Antichemical-protection service
2
Biography
2
Chemical decontamination
2
Christian life
2
Civil defense at factories
2