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1Publicado 1969### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofii︠a︡ : Izd-vo na Bŭlgarska akademii︠a︡ na naukite, 1969-1974.6 v. : ill., maps (some folded) ; 24 cm.Materias: “...Geology, Structural Bulgaria Periodicals....”
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2Publicado 1959### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Minno delo, -1959.v. : ill. ; 24 cm.Materias: “...Mining engineering Periodicals....”
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3Sofi︠i︡a : [s.n.],v. : ill. ; 28 cm.Materias: “...Mining engineering Periodicals....”
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4Sofi︠i︡a.v. ill., maps. 24 cm.Materias: “...Iron industry and trade Bulgaria Periodicals....”