New York: Experimenter Publishing Company, 1926. Large octavo, single issue, cover by Frank R. Paul, pictorial wrappers. Pulp magazine, bedsheet format. Fiction by H. G. Wells, Jules Verne, Garrett P. Serviss, A. Hyatt Verrill and Murray Leinster. [Reference: Tymm and Ashley, Science Fiction, Fantasy, and Weird Fiction Magazines, pp. 14-49].