. Transactions. Brin. , d= mm. S00° C. .ANNEAL Brin. , d= Brin. , d = mm. 850° C. anneal Brin. , d = mm. Fig. 13.—Etched with ammonia and hydrogen peroxide. X 75. W. H. BASSETT AND C. H. DAVIS 445

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries