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1Sofi︠i︡a : Izd. na Instituta za ra︠t︡sionaliza︠t︡si︠i︡a,Subjects: “...Technological innovations Periodicals....”
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2Published 1961### CRL customization ### ?> ### Add publisher and desc details ### ?>Sofi︠i︡a : Ra︠t︡sionaliza︠t︡si︠i︡a i standartiza︠t︡si︠i︡a, 1961-Subjects: “...Technological innovations Periodicals....”