Harris, Ann G.; Esther Tuttle; Sherwood D. Tuttle (2003). Geology of National Parks (6th edición). Kendall Hunt Pub Co. p. 649. ISBN978-0-7872-9970-5. Consultado el 13 de julio de 2014.
Baldwin, Kenneth H. (2005). «II— TERRA INCOGNITA: The Raynolds Expedition of 1860». Enchanted Enclosure:The Army Engineers and Yellowstone National Park. University Press of the Pacific. ISBN978-1-4102-2180-3. Archivado desde el original el 23 de octubre de 2012. Consultado el 13 de julio de 2014. «as far as practicable, everything relating to... the Indians of the country, its agricultural and mineralogical resources... the navigability of its streams, its topographical features, and the facilities or obstacles which the latter present to the construction of rail or common roads...»
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Baldwin, Kenneth H. (2005). «II— TERRA INCOGNITA: The Raynolds Expedition of 1860». Enchanted Enclosure:The Army Engineers and Yellowstone National Park. University Press of the Pacific. ISBN978-1-4102-2180-3. Archivado desde el original el 23 de octubre de 2012. Consultado el 13 de julio de 2014. «as far as practicable, everything relating to... the Indians of the country, its agricultural and mineralogical resources... the navigability of its streams, its topographical features, and the facilities or obstacles which the latter present to the construction of rail or common roads...»