1932 Booklet on Milling Methods at the Engels Copper Mining Co Plumas Co CA

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1932 Booklet on Milling Methods at the Engels Copper Mining Co Plumas Co CA:
$31.99

Up for sale is a January 1932 Booklet put out by the Department of Commerce on Milling Methods and Costs at the Superior Concentrator of the Engels Copper Mining Co of Plumas County Calif. It has 23 pages of information. It measures 8 x 10.5 inches and is in nice condition with a light stain at bottom right and a light crease