New York: Grosset & Dunlap, (1956) dj. Hardcover - The 8th and last book in this exciting series in the hard-to-find original format. Illustrated with a frontispiece, full page black and white drawings and many smaller pictures. Navy blue and whilte illustrated endpapers. Lists to itself on the front flap and in the book, but to Tom Swift Jr #11 on the rear flap (1958) and to Ken Holt #11 on back cover of dj. 181 pp.