Report of the Bureau of Mines of the Department of Internal Affairs of Pennsylvania . 428 riOPOKT OF THE BUREAU OF MINES. Off. Doc. Sis « « « * delielieort . o •D • 4j (U 4 Cj S cii eS « ai5 ti M M bt ^ c c c c ^ j K ^ CgS c cc ^•FF J; ca (fl t. o >, K K fC S 5 cc 3 c c c ; c c c c.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcoalmin, bookyear1900