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Kingman (vicinity), Arizona. Mr. Relling, in the laboratory, analyzing tungsten ore and concentrates in a plant near the Boriana mines where the chromium-like metallic elements are obtained
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Kingman (vicinity), Arizona. Tungsten ore being analyzed in a laboratory at a recovery plant near the Boriana mine
Kingman (vicinity), Arizona. A laboratory worker at a recovery plant near the Boriana mine selecting a sample of tungsten ore
Kingman (vicinity), Arizona. A laboratory worker at a recovery plant near the Boriana mine selecting a sample of tungsten ore