Born-Digital or AnalogAnalogTranscriptBerthoud tunnel. Clear Creek county, Colorado Contract let for development. R. M. News. July 12, 1882 p.3 c.2 Activities, Trail creek. R. M. News. Dec.7,1884 p.6 c.4 0.CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Berthoud tunnel. Clear Creek county, Colorado, [18450]. Denver Public Library Digital Collections, accessed 15/01/2026, https://digital.denverlibrary.org/nodes/view/1178146
