. Transactions. Brin. 400 C. axm: i Brin. Fig. 6.—Etched with ammonia and hydrogen peroxide. X 75. 438 A COMPARISON OF GRAIN-SIZE MEASUREMENTS .9 PER CENT. REDUCTION ^.. PER CENT. REDUCTION ecr-

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries