Born-Digital or AnalogAnalogTranscriptUnion tunnel. Brownville COLORADO Development to connect Silver ore mine shaft. R.M.News.Feb.24,1878 p.4 c.5 Description; activities; pay roll. R.M.News.Apr.ll,1878 p.4 c.3CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Union tunnel. Brownville COLORADO, [616529]. Denver Public Library Digital Collections, accessed 10/02/2026, https://digital.denverlibrary.org/nodes/view/1753192
