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  1. 1
    Published 1968
    Sofia : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1968-1987.
    20 v. : ill. ; 25 cm.
  2. 2
    Published 1964
    Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1964.
    1 v. : ill. ; 24 cm.
  3. 3
    Published 1965
    Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1965-1967.
    3 v. : ill. ; 24 cm.
  4. 4
    Published 1988
    Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1988-
    v. : ill. ; 24 cm.

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