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    • Mile High

    • Mile High

    • View of the head frame and ore chute of the Mile Hi Mine, Boulder County, Colorado.

    • Boulder County (Colo.)--1920-1930.; Mile Hi Mine (Boulder County, Colo.)--1920-1930.; Coal mining--Colorado--Boulder County--1920-1930.; Hoisting machinery--Colorado--Boulder County--1920-1930.; Mining--Colorado--Boulder County--1920-1930.;...

    • [between 1920 and 1930]

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