Letters to Paul E. Havens from his cousin S.L. Frey, January 12, 1902 - May 4, 1911, Box: 1, Folder: 44. Anthony and Havens family papers, RH MS 555. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/541811 Accessed May 18, 2024.