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1904 Colorado Silverton Quadrangle set of 6 sheets. U.S. Geological Survey George E. Walcott, Director
1. Topography 2. Economic Geology 3. Areal Geology 4. Structure Sections 5. Columnar Section 6. Illustrations
The economic geology is the one with the gold and silver ore load lines showing the locations of lands with the best chances for extracting the ore.
Each sheet measures 18 x 21.5"
price includes all six sheets
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