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1by Wiebelt, Frank J.Subjects: “...Copper mines and mining California El Dorado County....”
Published 1951
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2by McKee, Edwin H.Subjects: “...Geology California El Dorado County Maps....”
Published 1981
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3by Plouff, Donald, 1930-Subjects: “...Geomagnetism California El Dorado County Maps....”
Published 1981
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4by McKee, Edwin H.Subjects: “...Mines and mineral resources California El Dorado County Maps....”
Published 1982
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