. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. X-2i. X'fOO ^ 'â m Portion ofFifie enlarged. f # ;r jj. 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