X-Planes X-1 to X-29 Jane's all the world's aircraft : 1919 A Reprint of the 1919 Edition of All The World's Aircraft Luftwaffe X-planes German Experimental and Prototype Planes of World War II Jane's Historical aircraft from 1902 to 1916 Jane's pocket book 13; RPV's: Robot aircraft today War planes of the first World War fighters volume one Great Britain World Guide to Combat Planes one War planes 1945-1976 Soviet War planes War planes of the first World War Fighters : volume four France War planes of the first World War Fighters : volume five France War planes of the second World War Fighters volume one