Upper and Lower Falls
Paul Harness reading from Albert Peale's Journal 
Thursday, July 27, 1871, from Albert Peale's journal: "The falls, therefore, must be about 400 feet high. They are very pretty, indeed, and the sun shining on the spray formed a beautiful rainbow." 
- "U.S. Geological Survey Photographic Library," U.S. Geological Survey Photographic Library, 1871, section goes here, accessed November 21, 2012, http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.H.%20%20%2084&SIZE=medium
- Yellowstone's Photo Collection, Yellowstone National Park Archives, Yellowstone National Park, accessed February 7, 2013, http://www.nps.gov/features/yell/slidefile/index.htm.
- Marlene Merrill, ed., Yellowstone and the Great West: Journals, Letters, and Images from the 1871 Hayden Expedition (Lincoln: University of Nebraska Press, 1999), 137.
- Ibid., 136.