Martha Brinkerhoff Phelps, Photographer: A. Hinkel and Sons, Warrensburg, MO, ca. 188?, Box: 1, Folder: 70. George Walter Rayhill collection, RH MS 82. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/103595 Accessed May 19, 2024.