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1Sofi︠i︡a : Dŭrzh. Izd-vo Tekhnika,v. : ill. ; 23 cm.Subjects: “...Engineering....”
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2Published 1966Sofi︠i︡a : Dŭrzhavno izd-vo "Tekhnika", 1966-v. : ill. ; 22 cm.Subjects: “...Mining engineering Periodicals....”
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3Sofi︠i︡a : University,v. : ill. ; 22 cm.Subjects: “...Mining engineering Periodicals....”
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4Published 1954Sofi︠i︡a : Dŭrzhavno izd. "Nauka i izkustvo", 1954-1965.10 v. : ill. ; 22-23 cm.Subjects: “...Mining engineering Periodicals....”