Description
U. S. Department of Commerce Bureau of Mines Bulletin 330: Ventilation of the Large Copper Mines of Arizona
By G. E. McElroy
Published: 1930
Fair condition, thin, green softcover. The cover has a piece torn off the front, small tears, some residue, and some stain. Some pages have tiny tears on the edges. The title page has writing in pencil. Text and illustrations throughout are clean, clear, and legible.
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