Born-Digital or AnalogAnalogTranscriptMining. Hydraulic. Placer. Colorado Excellent article on placer mining in San Miguel. 2 pictures. Mining Industry v.2 #12 March 16, 1888 p.8-9 Summit County placers. Mines and Minerals v.23 p.241-244 1903 Dredging placer gravels at Breckenridge. Ibid. v.28 p.577-582 1908CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
