. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. UNITED STATES GEOLOGICAL SURVEY COPPER-BEARING ROCKS OF'LAKE SUPERIOR PL, VI. fe.; ^'^ ORTHOCLASE - GABBRO A. Roan & Co. LIth. Baltiiiuira -. 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