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Collective author: People's Republic of Bulgaria. National Information Office to the Council of Ministers
Copyright responsibility: People's Republic of Bulgaria. National Information Office to the Council of Ministers
Year published: 1970
Publishing house: National Information Office to the Council of Ministers;Sofia
Pages: 58 p.
Language: англ.
Signature: 48/ХР1
ID: NSI010010717
Collective author: Комитет по единна система за социална информация при Министерския съвет
Copyright responsibility: Комитет по единна система за социална информация при Министерския съвет
Year published: 1983
Publishing house: КЕССИ;София
Pages: 274 с.
Language: бълг.
Signature: 165/ХР1
ID: NSI010010976
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