Born-Digital or AnalogAnalogTranscriptHorsfal mine. Boulder county, Colorado David Horsfal, discoverer. Hall. History colorado Development; mill run. R. M. News. July 21, 1882 p.3 c.l Neikirk mill works ore. R. M. News. Oct. 20, 1882 p.3 c.4 New machinery. R. M. News. May 8, 1883 p.3 c.l Number of stamp treating ore. R. M. News. July 20, 1883 p.2 c.2CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Horsfal mine. Boulder county, Colorado, [319662]. Denver Public Library Digital Collections, accessed 08/02/2026, https://digital.denverlibrary.org/nodes/view/1444916
