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Upper end of sluice at Bonanza bar NYPL bGF ZB. en Upper end of sluice at Bonanza bar nypl org Scan by NYPL Upper end of sluice at Bonanza bar Snake River gold fields Gold mining Hydraulic mining The Miriam and Ira Wallach Division of Art Prints and Photographs Photography Collection fdacafccdabc GFZB Robert Dennis collection of