Bŭlgarska akademii︠a︡ na naukite, Sofia. Bŭlgarska entsiklopedii︠a︡
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Bulgarische Enzyklopädie (Firm)
Българска енциклопедия
Bŭlgarska akademii︠a︡ na naukite. Abteilung Bulgarische Enzyklopädie
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Bulgarian Encyclopaedia (Firm)
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Bulgarian Academy of Science. Bulgarian Encyclopaedia
