Philadelphia: David McKay Co, (c 1909). Hardcover first edition - A later title in this boy's adventure series adapted from the stories originally published weekly as the Motor Stories by Street and Smith as part of their paperback Dime Novels. Frontispiece on glossy stock. As the publisher's ad notes the boys had adventures with every kind of motor-driven machines - including motorcycles, automobiles, areoplanes and even submarines. 301 pp plus 1 p publisher's ad (which lists all 10 titles)