Typescript in looseleaf binder labeled "Forced Reverberation, 1962" with drawings, also color and black and white photographs, Box: 8, Folder: 20. Russell Randolph Hays papers, RH MS 564. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/278228 Accessed November 23, 2024.