Part of the north wall of the great hydraulic mine at North Bloomfield. Except at the extreme right the mining operations ceased more than twenty years ago. Nevada County, California. 1909. Courtesy U.S. Geological Survey. The USGS home page is http://www.usgs.gov
This photograph is by carnkie and was uploaded January 9th 2010. © carnkie please do not copy or distribute without prior express permission.
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