The Discovery of Yellowstone Park : Journal of the Washburn Expedition to the Yellowstone and Firehole Rivers in the Year 1870 - Langford, Nathaniel Pitt, 1832-1911 (Project Gutenberg, 2004)
Electronic text
Keywords: Yellowstone National Park -- Discovery and exploration; Langford, Nathaniel Pitt, 1832-1911 -- Diaries