. Transactions. 500° C. .^ C. Brin. d= mm. Brix. , d= xMM. Fig. 15.—Etched with ammoxia axd hydrogen peroxide. X 75. W. H. BASSETT AND C. H. DAVIS U7. 600° , d = mm. 650° , d= mm.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries