Born-Digital or AnalogAnalogTranscriptRichardson, J. C. and company Operate Gibson mine, Gilpin county. Colorado R.M. News. Apr. 5, 1884 p.4 c.2 Operate Gibson mine, Central City district Colo. R.M. News. Apr. 15, 1885CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Richardson, J. C. and company, [521795]. Denver Public Library Digital Collections, accessed 14/03/2026, https://digital.denverlibrary.org/nodes/view/1651014
