Memorandum of agreement with J. Harold Kilcoyne for settlement and compensation to Hays for use of Hays' drop-center rotor. April 17, 1950, Box: 7, Folder: 18. Russell Randolph Hays papers, RH MS 564. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/278207 Accessed May 05, 2024.