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    • Portal Argo Tunnel Idaho Springs, Colo.

    • Portal Argo Tunnel Idaho Springs, Colo.

    • Miners pose on electric velocipede cars and a tram engine near the entrance to the Argo Tunnel near Idaho Springs (Clear Creek County), Colorado. The tram engine pulls loaded mine ore cars.

    • Mine railroads--Cars--Colorado--Idaho Springs--1910-1920.; Argo Tunnel Mine (Clear Creek County, Colo.)--1910-1920.; Idaho Springs (Colo.)--1910-1920.; Miners--Colorado--Idaho Springs--1910-1920.; Mining--Colorado--Idaho Springs--1910-1920.

    • 1915

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