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^ A b “Chapter 4: The Early Years in Yellowstone: 1882-1886”. National Park Service. 2004. Accessed October 18, 2020.

^ A b c “Chapter 6: The Development of Policy: 1889-1894”. National Park Service. 2004. Accessed October 18, 2020.

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^ A b “Chapter 7: The Development of a Legal Structure”. National Park Service. 2004. Accessed October 18, 2020.

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^ Matthew A. Redinger (1991). “The Civilian Conservation Corps and the Development of Glacier and Yellowstone Parks, 1933–1942”. Pacific Northwest Forum, vol. 4, issue 2, pp.