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    • Placer mining at Alma Colo

    • Gold miners pose at a hydraulic mine in Alma, Park County, Colorado; bluffs in the background have erosion and falling water. Jets of water issue from "monitor" nozzles; a swivel crane is to the side.
    • Mining machinery--Colorado--Alma--1880-1900.; Alma (Colo.)--1880-1900.; Hydraulic mining--Colorado--Alma--1880-1900.; Miners--Colorado--Alma--1880-1900.; Mining--Colorado--Alma--1880-1900.
    • [between 1880 and 1900?]

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