. Bulletin. A. WHOLE SECTION OF OUTCROP OF PITTSBURGH COAL, GREATLY REDUCED. rri — irmwH^^^^ i IdffiIf *5 ***- ■■it££: &;%)^ff$*jt- r ! - - ---■„•. - -^,-3--- • 3 1 -ilEriPii-^ V. V^ J . «*?»*!*? t*^ A W$*t;tr, ( «4^ ^^^^ L3G £. A LUMP OF PITTSBURGH COAL. BUREAU OP MINES BULLETIN 117 PLATE XXXVII. OPAQUE VERTICAL SECTION OF COAL FROM THE OAK MINE, FIRST FOOT. (X 10) 137 BUREAU OF Ml NES BULLETIN 117 PLATE XXXVIII

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou