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21Published 1968### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1968-1974.7 v. : ill. ; 24 cm.
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22Published 1953### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Dŭrzhavno izd-vo "Nauka i izkustvo", [1953?]-1953.1 v. : ill., maps ; 25 cm.
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23Published 1964### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Izd-vo na Bŭlgarskata akademi︠i︡a na naukite, 1964-1967.3 v. : ill. ; 24 cm.
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24Published 1991### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Universitetsko izd-vo "Sv. Kliment Okhridski", 1991-v. : ill. ; 24 cm.