. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. â¢^Xj ii^V3r5^ ji«;^ 3«VS^V- i â V'^^ ,%TJ»0 mass, uiesti rociiii -^ -syenite" of Rosenbusch than to any other pr. â¢flic MI'P-rHi'f'l:!!'. u-1<^ T.^o descriijo'i fiuartz is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Irving, Roland Duer, 1847-1888. Washington, Govt. Print. Off.

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectgeology, bookyear1883