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1New Delhi : Govt. of India, Directorate General of Technical Development, Ministry of Industry,v. ; 30 cm.
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2New Delhi : Government of India, Directorate General of Technical Development, Ministry of Industry,v. : ill. ; 30 cm.
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3New Delhi, Govt. of India, Directorate of Public Relations & Publications, Directorate General of Technical Development.v. 21 cm.
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4[Delhi, Manager of Publications]24 cm.