Raleigh, Walter and H.A. Jones. War in the Air, 9 volume set. London, Oxford University Press, 1922-1937. This is the definitive history of the Royal Flying Corps/Royal Air Force in World War I, the original first edition not the reprint. Set includes two map cases with 42/28 maps, there are many other folding maps throughout the text. The last volume is Appendices dated 1937. Vol VI is ex-libris RAF library (about fair with numerous RAF library stamps). Vols II, Vol III maps and Vol V carry RAF Staff College Library bookplates. The set averages good condition. For a very similar set in my library, I paid $1000 many years ago. On-line prices are in the $2000-3000 range. This set is very reasonably priced.