Correspondence from Frank H. Unruh to sister Emma Unruh Voth, 1961, Box: 14, Folder: 35. Voth, Unruh, and Banman families collection, RH MS 1455. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/375064 Accessed January 14, 2025.