The Flying Machine Boys On Duty - vintage children's series book from 1913 - Free US Shipping Nice clean copy of this title from "The Flying Machine Boys" series. Illustrated frontispiece and title page in black and white. Some mild wear and soil, former owner's name in pencil on front endpaper. 5 x 7.5 inches with 256 pages. The Flying Machine Boys On Duty Frank Walton A.L. Burt, 1913 #antiquarian #childrensbooks #seriesbooks #1900s #vintagebooks