VOR. New York: Avon Publications, Inc., . Small octavo, pictorial wrappers. First edition. Avon Books T238. An invulnerable alien machinelike being sent to Earth must be destroyed, otherwise it will destroy Earth. A novel expanded from "The Weakness of RVOG," a story by Blish and Damon Knight first published in THRILLING WONDER STORIES, February 1949. A fine copy. (#157977).
No statement of printing.