Van Vogt, A.E. and E. Mayne Hull. The Winged Man - Thirty Thousand Years Into The Future. , 1966, 1980

Van Vogt, A.E. and E. Mayne Hull. The Winged Man - Thirty Thousand Years Into The Future. , 1966, 1980, Box: 39, Folder: 38. Donald A. Wollheim papers, MS 250. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/242744 Accessed December 25, 2025.