Born-Digital or AnalogAnalogTranscriptEdison, Thomas Alva Edison solves problem of low grade ore treatment. [Idaho Springs] Clear Creek Miner my 11, 1912 p.1 c.5 Idaho Springs] Clear Creek Miner Jy 8, 1911.p.1 c.2CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng