Home > Authors > Joseph K. McGregor > Photographs of historical mining operations in Colorado and Utah from the U.S. Geological Survey Library
Photographs of historical mining operations in Colorado and Utah from the U.S. Geological Survey Library
Contains 558 scanned photographs from the U.S. Geological Survey Photographic Library that provide literal snapshot views of Colorado and Utah mining operations. Each approximately 1.16 megabytes and stored in a PCX format.
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