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  • All fields: Coal mining--Colorado--Boulder County--1920-1930.
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    • Matchless

    • View of the head frame and power house of the Matchless Mine in Boulder County, Colorado. A miner sits by a pile of lumber nearby.
    •  
    • [between 1920 and 1930?]
    • Mile High

    • View of the head frame and ore chute of the Mile Hi Mine, Boulder County, Colorado.
    •  
    • [between 1920 and 1930]

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