Otis Burger - String That Went Up (1962), Rosel Brown and Keith Laumer - Earthblood (1977), Reginald Bretnor - Sci-Fi, Today and Tomorrow (1972), Box: 3, Folder: 23. 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/229617 Accessed April 29, 2024.