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1Published 1954### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Dŭrzhavno izd-vo Nauka i izkustvo, 1954-1966.18 v. : ill. ; 22 cm.“...Mashinno-elektrotekhnicheski institut (Sofia, Bulgaria)...”
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2Published 1967### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Dŭrzhavno izd-vo Tekhnika, 1967-1970.4 v. : ill. ; 22 cm.“...Vissh mashinno-elektrotekhnicheski institut (Sofia, Bulgaria)...”