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Keywords from Image Description:
Placer Mining Columbia Tuolumne Co. from the top of the dumpbox NYPL bGF B. en Placer Mining Columbia Tuolumne Co from the top of the dumpbox nypl org Scan by NYPL Placer Mining Columbia Tuolumne Co from the top of the dumpbox no Hydraulic mining Mineral industries Environmental aspects The Miriam and Ira Wallach Division