"Som [sic] Earlier Phases of Scientific Thought," lecture text by E.H.S. Bailey (10 pages), December 18, 1906, Box: 5, Folder: 39. Personal papers of E.H.S. Bailey, PP 158. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/116326 Accessed November 22, 2024.