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  • All fields: Drills (Equipment)--Colorado--1880-1910.
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    • Breast of tunnel

    • Miners stand with an electric drill, pickax, and chisolm shovel, in a narrow tunnel of an unidentified mine in probably Colorado.
    • Drills (Equipment)--Colorado--1880-1910.; Miners--Colorado--1880-1910.; Mining--Colorado--1880-1910.
    • [between 1880 and 1910?]

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