Born-Digital or AnalogAnalogTranscriptHumphrey concentration mill. Black Hawk district colorado Works Vancouver mine ore. 1882 Works clay co. mine ore. R. M. News. Aug. 16, 1882 p.3 c.3 Operating. R. M. News, Apr. 11, 1885 p.3 c.1 Proposed activities. R.M News. June 30, 1884 p.3c5 Treats Barden mine ore; returns. R. M. News. Dec. 7, 1995 p.8 c.3CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Humphrey concentration mill. Black Hawk district colorado, [324411]. Denver Public Library Digital Collections, accessed 07/12/2025, https://digital.denverlibrary.org/nodes/view/1456128
