Tuesday, July 25, 1871, from Albert Peale's journal: "After dinner I went to look at Tower Falls. They are very fine. The water makes a semicircular turn thenforms a series of small falls and then rushes over the precipice falling 156 feet [measured today at 132 feet]." 
- "Thomas Moran," Smithsonian American Art Museum, accessed February 25, 2013, http://americanart.si.edu/.
- 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), 134.