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Courtesy of Society of California Pioneers
http://www.oac.cdlib.org/ark:/13030/kt9v19q3qm/?order=1
Title:
1018. Placer Mining -- Columbia Gulch, Tuolumne County. From the West.
Creator/Contributor:
Lawrence & Houseworth, publisher
Date:
1860/1870
Contributing Institution:
Society of California Pioneers