Report of the Bureau of Mines of the Department of Internal Affairs of Pennsylvania . 660 REPORT OF THE BUREAU OF MINES. Off. Doc. ^1 ^5 a; 1 0] 1-0 ^ BS .:i|: •£? : c • :.c E C 0/ ? N— ^ t£-M . ^: TO to; i^f £•= ? t. fee a; -3 ?„? • . t, o ^_-r ^ a; .c<^c -cot. C K-iu c.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcoalmin, bookyear1900