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  • All fields: Mills--Colorado--Boulder County--1920-1940.
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    • Boulder Co. tunnel, Cardinal

    • View shows the connected, shed roofed mining buildings of the Boulder County mill in Cardinal, Boulder County, Colorado. It produced both gold and silver and was completely covered to weatherize against the storms that blew off the high range....
    • Mine buildings--Colorado--Boulder County--1920-1940.; Boulder County (Colo.)--1920-1940.; Mills--Colorado--Boulder County--1920-1940.; Mining--Colorado--Boulder County--1920-1940.
    • [between 1920 and 1940?]
    • Caribou mill

    • View shows the deteriorating mill building of the Caribou mine, Boulder County, Colorado. Boilers, flywheels, and other debris are scattered on the ground.
    • Mills--Colorado--Boulder County--1920-1940.; Boulder County (Colo.)--1920-1940.; Caribou Shaft (Boulder County, Colo.)--1920-1940.; Mining--Colorado--Boulder County--1920-1940.
    • [between 1920 and 1940?]

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