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Mica-mining methods, costs, and recoveries at no. 10 and no. 21 mines of the Spruce Pine Mica Co., Spruce Pine, N.C.

Published Year

• 1930-1939 (1)

Subject

• Mica--North Carolina (1)
• Mining engineering--North Carolina (1) *

Author

• Urban, H. M. (1)

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