Born-Digital or AnalogAnalogTranscriptHumboldt mine. Boulder county, Colorado R. M. News. Sept. 26, 1867.p.4 c.3 R. M. News. Dec. 17, 1880. p.4 c.4 R. M. News. July 10, 18e.5 p.^3 c.l Activities; results. History. 'Seeks' output.CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Humboldt mine. Boulder county, Colorado, [324098]. Denver Public Library Digital Collections, accessed 05/03/2026, https://digital.denverlibrary.org/nodes/view/1455401
