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  • All fields: Boring--Colorado--Gilpin County--1940-1950.
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    • Minnesota Mine, 1 man drilling

    • A miner works in the Minnesota Mine in Gilpin County, Colorado. He holds a drill and works near metal framework. He wears a helmet and work clothes.
    • Gilpin County (Colo.)--1940-1950.; Minnesota Mine (Gilpin County, Colo.)--1940-1950.; Boring--Colorado--Gilpin County--1940-1950.; Interiors--Colorado--Gilpin County--1940-1950.; Miners--Colorado--Gilpin County--1940-1950.; Mining--Colorado--Gilpin...
    • [1940-1950?]

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