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1Published 1960Sofia : Izdatelstvo na Bŭlgarskata akademii︠a︡ na naukite, 1960-1961.4 v. : ill. ; 24 cm.“...Bulletin de l'Institut central de culture des plantes....”
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2Sofi︠i︡a : Druzhestvoto na spe︠t︡sialistit︠i︡e vŭ zemed︠i︡elskit︠i︡e opitni instituti vŭ Bŭlgari︠i︡a,v.“...Revue des instituts de recherches agronomique en Bulgarie...”