. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. UNITED STATES GEOLOGICAL SURVEY l^.SWyi'. COPPER-BEARING ROCKS OF LAKE SUPERIOR PL, XXV JMAP SHOW^I^G POSITIONS OF EXPOSURES OF KEAM5ENAWAN ROCKS IN THE UPPER ST CROrS VALLEY^VlSCO:SSm, BASED OH TJEPORT OF MOSES STROKG -GEOLOGY OF YflSCONSTl\r, VOL TE. Scale miles to 1 in 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 re
. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. UNITED STATES GEOLOGICAL SURVEY l^.SWyi'. COPPER-BEARING ROCKS OF LAKE SUPERIOR PL, XXV JMAP SHOW^I^G POSITIONS OF EXPOSURES OF KEAM5ENAWAN ROCKS IN THE UPPER ST CROrS VALLEY^VlSCO:SSm, BASED OH TJEPORT OF MOSES STROKG -GEOLOGY OF YflSCONSTl\r, VOL TE. Scale miles to 1 in 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
