. Hydraulic mining, at Gold Run, Placer County. Coverage: 1866?-1872?. Source Imprint: San Francisco : C. E. Watkins, 1866?-1872?. Digital item published 8-11-2006; updated 7-22-2008. 147 Hydraulic mining, at Gold Run, Placer County, by Watkins, Carleton E., 1829-1916

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