Bulmer, K, THE ELECTRIC SWORD-SWALLOWERS , and Rackham, J, BEYOND CAPELLA, , 1971, Box: 27, Folder: 56. Donald A. Wollheim papers, MS 250. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/242004 Accessed June 22, 2025.