"The Use of Mice for the Assay of Erythropoietin in Sheep Plasmas" by Penny, R.C.H, Wright, A.I, and Grunsell, C.S, 1964, Box: 4, Folder: 23. Personal papers of John "Jack" A. Weir, PP 404. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/261359 Accessed May 15, 2024.