Born-Digital or AnalogAnalogTranscriptmines and mineral resources Colorado notes on mining exposition. 1883 article new york economist coal iron company mentioned mines chicago mining review carbonates counties mining gazetteCollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
mines and mineral resources Colorado, [423817]. Denver Public Library Digital Collections, accessed 16/01/2026, https://digital.denverlibrary.org/nodes/view/1800350
