The Raynolds Expedition was a United States Army exploring and mapping party which left St. Louis, Missouri May 29, 1859 and was intended to map the unexplored territory between Fort Pierre, Dakota Territory and headwaters of the Yellowstone River. Led by experienced explorer and topographical engineer Captain William F. Raynolds, other members included photographer James D. Hutton, geologist and naturalist Ferdinand Vandeveer Hayden. The expedition was guided by legendary mountain man Jim Bridger.
- Baldwin, Kenneth H. (November 15, 2004). "Terra Incognita: The Raynolds Expedition of 1860". Enchanted Enclosure. U.S. Army. Retrieved May 14, 2011.
- "Raynolds Expedition 1859-60 and Bighorn Canyon". National Park Service. February 15, 2010. Retrieved May 14, 2011.
- Chittenden, Hiram Martin (April 1, 2005 (Originally in 1911)). The Yellowstone National Park Historical and Descriptive. Kessinger Publishing, LLC. p. 57. ISBN 1-4179-0456-9. Retrieved May 14, 2011.
- Palmquist, Peter E.; Kailbourn, Thomas R. (2000). "Hutton, James Dempsey". Pioneer photographers of the far west: a biographical dictionary, 1840-1865. Palo Alto, California: Stanford University Press. pp. 315–318. Retrieved May 14, 2011.