Author: VIVIAN, HARRY
Title: Department of Commerce, United States Bureau of Mines Information Circular: Deep Mining Methods, Conglomerate Mine of the Calumet and Hecla Consolidated Copper Co. [Information Circular No. 6526, October, 1931]
Description: Washington, DC, Department of Commerce, United States Bureau of Mines. 1931. Wraps, 4to - Over 9 ¾" -12" Tall. Ill.: Maps, Schematics, Drawings, Layouts. Paperback, Original publication. Light edge wear with heavily stained covers. Bent and creased corners and edges. 20p. Good.

Keywords: Mining, Deep Mining, Geology, Geophysics Maps, Schematics, Drawings, Layouts


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