Core Grant, MRRC, KU # 4060, Miscellaneous, Kansas City MR Unit, Earl Butterfield, March, 1970, Box: 18B, Folder: 32. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/452750 Accessed May 24, 2025.