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    • Rocky Mountain Fuel Company mine

    • Rocky Mountain Fuel Company mine

    • View of a portable head frame by a mine shaft in Boulder County, Colorado. A miners' camp is nearby.

    • Rocky Mountain Fuel Company--Facilities--1910-1920.; Boulder County (Colo.)--1910-1920.; Coal mining--Colorado--Boulder County--1910-1920.; Hoisting machinery--Colorado--Boulder County--1910-1920.; Mining--Colorado--Boulder County--1910-1920.

    • [between 1910 and 1920]

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