THE RADIO BOYS ON SIGNAL ISLAND OR WATCHING FOR THE SHIPS OF MYSTERY (Radio Boys Series)

New York:Grosset and DUnlap Publishers. (1926). 224pp. Illustrated by Walter S. Rogers. Hardcover.  Blue boards lightly soiled and rubbed and shelfworn, with wear along edges, spine ends and edge points. Page edges lighlty soiled. Internally clean, free of previous owners marks or signatures. The binding is tight but cocked, with hinges intact. The title lists to itself on the copyright page.