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Subjects
Civil defense
55
History
36
Agriculture
22
Industry
22
Military
22
Education
21
Biography
14
Culture
12
Housing
12
Warsaw Pact
10
Civil defense exercise
9
Sports
9
Arts
8
Council for Mutual Economic Assistance
8
Consumer goods
7
Decontamination of food
7
Economy
7
Evacuation
7
Geography
7
World War II
7