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1Published 1965Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1965-1974.17 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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2by Mikhaĭlov, M.
Published 1966Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1966.119 p. : ill. ; 21 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”