Raamatud Sylvanite, Inc
Geology and Ore Deposits of the Creede District, Colorado
William H. Emmons, Esper S. Larsen
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Geology and Ore Deposits of Shoshone County, Idaho
Joseph P. Umpleby, E. L. Jones
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Gold Placers and Their Geologic Environment in Northwestern Park County, Colorado
-40% koodiga BOOKS
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Arizona Lode Gold Mines and Gold Mining
Eldred D. Wilson, G. M. Butler, J. B. Cunningham
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Lode and Placer Gold Deposits of New Mexico
Maureen G. Johnson, T. P. Wootton, O. H. Metzger
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Economic Geology of the Silverton Quadrangle, Colorado
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Placer Examination Principles and Practice
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