OX. [New York]: Avon, . Small octavo, pictorial wrappers. First paperback edition. Avon Books 29702. The heroes, government agents exploring the alternate dimensions of time and space, are trapped in a world dominated by a machine intelligence. Third book of a trilogy, preceded by OMNIVORE (1968) and ORN (1971). Very light crease to upper fore-edge corner of front cover, else a fine copy. (#158020).
"First Avon Printing, August, 1976" on copyright page.