Map of a Reconnaissance of the Black Hills

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Citation

This primary source comes from the Records of the Office of the Chief of Engineers.

National Archives Identifier: 139308964

Full Citation: US 490-3-2; Map of a Reconnaissance of the Black Hills; 1874; United States; Civil Works Map File, 1818–1947; Records of the Office of the Chief of Engineers, Record Group 77; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/document/reconnaissance-map-black-hills/, February 28, 2026]

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