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1Published 1968Sofia : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1968-1987.20 v. : ill. ; 25 cm.Subjects: “...Agriculture Economic aspects Bulgaria Periodicals....”
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2Published 1988Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1988-v. : ill. ; 24 cm.Subjects: “...Agriculture Economic aspects Bulgaria Periodicals....”