Observer's world aircraft directory ; 1961 Flugzeuge der Welt : heute morgen Combat aircraft of the world : the first complete, authortative, fully-illustrated guide ot combat aircraft Aircraft of the fighting powers : volume 6 Aircraft of the fighting powers : volume 7 American Warplanes :World War two-Korea Volume II Rise of the Fighter Aircraft 1914-1918 War planes of the first World War fighters volume one Great Britain World Guide to Combat Planes one Gevechtsvliegtuigen 14-18 deel 1 Gevechtsvliegtuigen 14-18 deel 2 Jachtvliegtuigen Wereldoorlog II : dl. 3