“Our camp is one of the many handsome parks on the headwaters of the Gallatin, Yellowstone National Park. At the right is the Palace Butte.” William Henry Jackson, 1870-1889. L. Tom Perry Special Collections, Harold B. Lee Library, Brigham Young University. MSS1608 Item 833.
https://contentdm.lib.byu.edu/digital/collection/Jackson/id/4341