. Bulletin. B. LAMINATION IN COAL FROM ROYALTON, ILL. (X 10) 118 BUREAU OF MINES BULLETIN 117 PLATE XXIII. OPAQUE CROSS SECTION OF COAL FROM ZEIGLER, ILL. (X 10) 119 BUREAU OF Ml NES BULLETIN 117 PLATE XXIV

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou