Harleyford, 1st ed., 1956. 212 pp., cold., plates + b&w frontis. & photo-ills. + ills. D.j., 28.5 x 22cm. FINE. This book is the first to show how aircraft types and their variants may be distinguished by their markings and it explains their significance. Markings are all indicative: a serial number relates to an aircraft's inception, code letters and devices are a guide to the unit, the mode of camouflage to a theatre of operations and many other, smaller markings, reveal much of interest. Superbly illustrated with some very attractive colour plates. Another excellent Harleyford title.