Born-Digital or AnalogAnalogTranscriptCentral City tunnel. Gilpin co. Colorado. Progress, steam drill. R. M. News. Day 23, .1877 p.4 c:4 Activities; lodes intersected, Central City tunnel co. R.M.News. June 17,1878 p.4 e.4 0CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Central City tunnel. Gilpin co. Colorado, [151190]. Denver Public Library Digital Collections, accessed 15/01/2026, https://digital.denverlibrary.org/nodes/view/1216863
