Born-Digital or AnalogAnalogTranscriptBertha mine. Pitkin district. Colorado. Description; transfer. R. M. News. Sept. 7, 1880. p.3 c.2 Interest transfer. R. M. News. Dec. 3, 1880. p.2 c.3 Description; development; assays. R. M.. News. Aug. 8, 1882. p.2 c.1 Activity. R. 141. News. Aug. 12, 1884 p.6 c.4 Mill run; ye idl R. M. News. Sept. 15, 1884 p.3 c-3 Mill run returns. Republican 1881 p. 5 c. 2 ! 0CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Bertha mine. Pitkin district. Colorado, [16979]. Denver Public Library Digital Collections, accessed 17/03/2026, https://digital.denverlibrary.org/nodes/view/1176824
