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United States.ǀbBureau of Public Roads; United States. Department of the interior, YNPHS Routes 1-A. 1-B, & 1-C, Mammoth to Old Faithful: Obsidian Cliff to Firehole Cascades Surfacing & Oiling (1928-1931). Montana History Portal, accessed 18/04/2026, https://www.mtmemory.org/nodes/view/98641






