. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. RIOE ing gahb .-^^^ f;raiDed cottree-grain* A; TCftinons; IjrownUb; au- pte in loog radi- atingblades. Sp. Y^Moti iiKs', S. ^ I gr., jiSi*r«,v> >.N c c' . 'â ^*'^^ ^'^ ^'^â OoL VS: -^ ' T^;*'^ dose; «tonirerl 80 88 68. ^pafite, large and ahmi lahradoriU; /eroua magu. long, twiniied \t- lage; ochre ; ma* i/uarfcr. Apatite! labradoriti' .⢠21 18 1 39 , , .. '^^â ««'^4' v^iVaiftK-^.ii. ^""Viwrf-V diaHofficou-7i<e,much tT^s â¢'^^i^aVs^Ac (Not sarveyed.)

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. The copper-bearing rocks of lake Superior / by Roland Duer Irving. Geology; Geology; Copper ores; Copper ores. RIOE ing gahb .-^^^ f;raiDed cottree-grain* A; TCftinons; IjrownUb; au- pte in loog radi- atingblades. Sp. Y^Moti iiKs', S. ^ I gr., jiSi*r«,v> >.N c c' . 'â ^*'^^ ^'^ ^'^â OoL VS: -^ ' T^;*'^ dose; «tonirerl 80 88 68. ^pafite, large and ahmi lahradoriU; /eroua magu. long, twiniied \t- lage; ochre ; ma* i/uarfcr. Apatite! labradoriti' .⢠21 18 1 39 , , .. '^^â ««'^4' v^iVaiftK-^.ii. ^""Viwrf-V diaHofficou-7i<e,much tT^s â¢'^^i^aVs^Ac (Not sarveyed.). 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