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  • All fields: Smelters--Colorado--Blackhawk--1860-1870.
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    • Prof. Hill's Works at Blackhawk, Colo.

    • Men stand outside frame processing buildings at Professor Nathaniel P. Hill's Black Hawk Smelter in Black Hawk (Blackhawk, Gilpin County), Colorado. Vented buildings have smokestacks. Men use shovels and wheelbarrows to move ore piles.
    • Hill, N. P. (Nathaniel Peter), 1832-1900--Homes & haunts.; Blackhawk (Colo.)--1860-1870.; Ore industry--Colorado--Blackhawk--1860-1870.; Smelters--Colorado--Blackhawk--1860-1870.; Smokestacks--Colorado--Blackhawk--1860-1870.
    • [between 1867 and 1868]

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