Born-Digital or AnalogAnalogTranscriptColumbus mine. Black Hawk district colorado Milling ore. 1880 p.2 C.1 Retort; description, Bobtail hill. R. It . News. June 9, 1881 p.3 c.1 Character of ore, Bobtail hill. R. M. News. Mar. 23, 1892 p . 3 c.1 0CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
Columbus mine. Black Hawk district colorado, [49707]. Denver Public Library Digital Collections, accessed 22/01/2026, https://digital.denverlibrary.org/nodes/view/1213324
