Method of Working the Pittsburgh Seam: A Plan of Working to Economically and Safely Remove all the Coal

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OH_MIN_JNL_v21_069.pdf (289.89 KB)

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1892

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Research Projects

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Ohio Mining Journal, no. 21 (1892), 69-73.

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http://hdl.handle.net/1811/32646

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Ohio Mining Journal: Whole no. 21 (1892)