New York: Ace Books, 1958. No. D-303. Vintage paperback. First printing of this edition. SIGNED by the author on the title page of "War of the Wing-Men."
Cover art ("Wing-Men") by Ed Emsh (Edmund Emshwiller), noted for his sci-fi digest illustrations, and his first cover came for Galaxy in 1950.
Very Good in illustrated wrappers. Reader's crease to the wrappers, moderate rubbing to the spine ends.
Schreuders, Piet, "The Book of Paperbacks" (1981) US.