Born-Digital or AnalogAnalogTranscriptHenderson, G W Writes for U.S.Geological survey,on mining methods,1917.Stone.History colorado Reports on metals & prices,Black Hawk smelter 1870. Stone.Hist.Colo. v.1 p.314CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
