. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. ^?.>. }VDi'.icles or patches ai^iiii>'%; i<sk«!i5K. lirif- f' II *'» â ^:yT!r '>f*â jV» .»^-?'^' \'^ .r ^^-^ v^. .^ s^ -^^ ^' &--)<. 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