Born-Digital or AnalogAnalogTranscriptCrosby and Thompson Ore process mentioned, Nevada gulch, Colorado. , 1865 p. 3 Mill owners, Boulder county. , 1865 o. 2 c 2 . Desulphurizer installed, janitor mill, Russell gulch , 1865 p. 2 c.2 furace nearly completed, Black Hawk, Colorado. , 1865 p. 4 c.3 Mentioned, Black hawkCollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
