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  • All fields: Mining equipment--1940-1950.
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    • Caribou, Colo. early mine machinery 1941

    • Caribou, Colo. early mine machinery 1941

    • A wooden drive wheel from an early mine stands in the foreground on a ridge near Caribou in Boulder County, Colorado. A partially-shown person carrying a camera tripod walks in the left background. A tall tree is in the right background.

    • Mining equipment--1940-1950.; Boulder County (Colo.)--1940-1950.; Caribou (Colo.)--1940-1950.

    • [1941?]
    • Caribou, Colo. early mine machinery 1941

    • Caribou, Colo. early mine machinery 1941

    • A wooden drum from a "slack-belt" hoist (widely used in Caribou mines during the early mining days) and a boiler that supplied steam to activate the hoist and pumps, stand in the foreground on a hill near Caribou in Boulder County, Colorado. Pine...

    • Mining equipment--1940-1950.; Boulder County (Colo.)--1940-1950.; Caribou (Colo.)--1940-1950.; Boilers--1940-1950.; Hoisting machinery--1940-1950.

    • [1941?]

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