United States. War Department. Division of Military Aeronautics · Washington, Govt. print. off. · leaf 48
FIGHTING IN THE AIR MAKES THE MOST SEVERE DEMANDS ON PILOTS. Only the most fit are chosen for this work. CADET AMONG THE CLOUDS. A situation in which vision' is of little use. The “motion-sensing” portion of the interval ear must be normal, or the pilot can not detect movement normally. 20a-2
Aeronautics, Military · Medicine, Military · Air pilots
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
