Harrison - The Deathworld Trilogy (1974, 1975), Deathworld II (1963, 1965), [Deathworld] 3 (1968), Box: 9, Folder: 33. 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/230250 Accessed November 23, 2024.