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Sources
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1Published 1975Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1975-1980.10 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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2Published 1975Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1975-1991.17 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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3Sofi︠i︡a, Izd-vo na Bŭlgarskata akademi︠i︡a na naukite.27 v. ill. 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite....”
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4Published 1975[Sof︠i︡a, Izd-vo na Bŭlgarskata akademi︠i︡a na naukite] 1975-ill. 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite]...”
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5Published 1987Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1987-v. ; 25 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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6Published 1982Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1982-1989.9 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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7Published 1963Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1963-1967.5 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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8Published 1968Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1968-1971.v. : ill.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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9by Iliev, Ivan, st.n.s
Published 1964Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1964.246 p. : ill. ; 21 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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10Published 1968Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1968-1974.7 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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11Published 1972Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1972-v. : ill.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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12[Sofi︠i︡a, Izd-vo na Bŭlgarskata akademi︠i︡a na naukite]v. ill. 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite]...”
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13Published 1964Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1964-1967.3 v. : ill. ; 24 cm.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”
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14Published 1975Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1975-v. : ill.“...Izd-vo na Bŭlgarskata akademi︠i︡a na naukite,...”