Set of five manuals, reportedly the property of a WWII P-51 pilot and likely acquired in flight school. In the photo from right-to-left: 1) TM 1-400, Theory of Flight, 1941; 2) TM 1-405, Aircraft Engines, 1941; 3) Civil Aeronautics Bulletin No. 24, Practical Air Navigation, 1945; 4) & 5) Civil Aeronautics Bulletin No. 25, Meteorology for Pilots, 1943/1940. Varying conditions; average fair; these have kicked around for about 75 years. The lot price reflects condition.