Chicago: Ziff-Davis Publishing Company, 1941. Octavo, single issue, cover by J. Allen St. John, pictorial wrappers. Pulp magazine. Feature story, a John Carter of Mars adventure, "Invisible Men of Mars" by Edgar Rice Burroughs. This story is this fourth and final part of LLANA OF GATHOL. Also includes a William P. McGivern story writing as "P. F. Costello." [Reference: Heins p. 130. Tymm and Ashley, Science Fiction, Fantasy, and Weird Fiction Magazines, pp. 14-49].

Chicago: Ziff-Davis Publishing Company, 1941. Octavo, single issue, cover by J. Allen St. John, pictorial wrappers. Pulp magazine. Feature story, a John Carter of Mars adventure, "Invisible Men of Mars" by Edgar Rice Burroughs. This story is this fourth and final part of LLANA OF GATHOL. [Reference: Heins p. 130. Tymm and Ashley, Science Fiction, Fantasy, and Weird Fiction Magazines, pp. 14-49].

Chicago: Ziff-Davis Publishing Company, 1941. Octavo, single issue, cover by J. Allen St. John, pictorial wrappers. Pulp magazine. Feature story, a John Carter of Mars adventure, "Invisible Men of Mars" by Edgar Rice Burroughs. This story is this fourth and final part of LLANA OF GATHOL. [Reference: Heins p. 130. Tymm and Ashley, Science Fiction, Fantasy, and Weird Fiction Magazines, pp. 14-49].