Blue Rock Crystal Mine, Black Hills National Forest. South Dakota.
1938
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Mine entrance in slope, sign, tractor, and rear of automobile.
This primary source comes from the Records from the Forest Service.
National Archives Identifier: 286139
Full Citation: Blue Rock Crystal Mine, Black Hills National Forest. South Dakota.; 1938; Records from the Forest Service. [Online Version, https://www.docsteach.org/documents/document/blue-rock-crystal-mine-black-hills-national-forest-south-dakota, May 1, 2024]Rights: Public Domain, Free of Known Copyright Restrictions. Learn more on our privacy and legal page.