Fawcett Gold Medal paperback original. One of two identical printings. Science fiction stories: Legwork (1956) by Eric Frank Russell; Conditionally Human (1952) by Walter M. Miller, Jr.; Stamped Caution (1953) by Raymond Z. Gallun; Dio (1957) by Damon Knight; Shadow World (1957) by Clifford D. Simak.
Used availability for Groff Conklin's 5 Unearthly Visions