Simak - They Walked Like Men (1963), The Trouble with Tycho (1976, 1977), The Night of the Puddly (1974), Box: 20, Folder: 5. Corporate Papers of the Robert Mills Literary Agency, MS 307. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/230623 Accessed November 23, 2024.