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1Sofi︠i︡a, Izd-vo na Bŭlgarskata akademi︠i︡a na naukite.2 v. ill.
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2Varna, Dŭrzhavno izd-vo.1 v. ill.
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3Published 1984### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Ministerstvo na zemedelieto, -1984.v. : ill., ports.