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U.S. Geological Survey Photographic Library

All books by U.S. Geological Survey Photographic Library

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Photographs from the U.S. Geological Survey Photographic Library

Photographs from the U.S. Geological Survey Photographic Library

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

Joseph K. McGregor

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