Montana Department of Environmental Quality, Hard Rock Mining Records, UPRS-232, Box: UPRS 232 Box 1; Box: UPRS 232 Box . Montana Historical Society, Research Center Archives.
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Montana Department of Environmental Quality, Hard Rock Mining Records, UPRS-232, Box: UPRS 232 Box 1; Box: UPRS 232 Box . Montana Historical Society, Research Center Archives. https://mhs.libraryhost.com/repositories/2/resources/497 Accessed April 28, 2025.
