Magnesite mines
H.C. Warwick magnesite mines two and one-half miles northeast of Madrone. Note mine on crest of ridge. Santa Clara County, California. September 4, 1917.
Courtesy U.S. Geological Survey. The USGS home page is http://www.usgs.gov.
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This photograph is by carnkie and was uploaded December 14th 2009. © carnkie please do not copy or distribute without prior express permission.
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