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hearth furnaces. Ray, H.S. et al. (1985). Extraction of Nonferrous Metals. Affiliated East-West Press Private Limited. pp. 131,132. ISBN 81-85095-63-9....2 KB (282 words) - 17:47, 4 January 2021
Metals. Affiliated East-West Press Private Limited. pp. 131, 132. ISBN 81-85095-63-9. Ray, Hem Shanker (1985). Extraction of Nonferrous Metals. ISBN 9788185095639...7 KB (811 words) - 09:57, 18 July 2024
