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Article · WARD Documents · April 22, 1922 · page 7
Walter A. Rukeyser, Asbestos Mining and Milling in Quebec, Part II (1922)
In the document: …been put back into the has been done using the “Jumbo” on the harder Thetwith extremely satisfactory results. ford and Black Lake rocks, and the machine is finding one of these machines is doing flow sheet…