Letter from P. Schuyler Miller to Vanguard Press, "The Reference Library," Astounding Science Fiction, April 13, 1953, Box: 16, Folder: 697. Papers of P. Schuyler Miller, MS 255. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/249718 Accessed May 06, 2024.