Author: Benedict, C. Harry; U.S. Department of Commerce, Bureau of Mines,
Title: Milling Method & Cost at Conglomerate Mill of Calumet & Hecla Consolicated Copper Co. - Information Circ. 6364, November 1930.
Description: Department of Commerce, 1930. Trade Paperback., Vg- in Wraps. Stapled Pages, 2-Hole Punched. Pages: 23. Light Wear & Toning. Brief Notations at Front. Text Block Clean & Tight.

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