Report of the Bureau of Mines of the Department of Internal Affairs of Pennsylvania . Off. Doc Oj q,.3 3SIS • c-M ^ ? CO • ? b c »? w « c ; g a> - tS . ,5 o o n O 3 C c 3 3 c 3 :

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcoalmin, bookyear1900