Charles A. Zweng is the author of Flight Instructor, a manual for all-things flying. Various editions have existed throughout the years in various conditions. This 1950 edition has held up better than most. The cover has some creases, but the pages are free from marks, complete, and the binding is solid for its construction. These were published from the mid-40’s to the mid-50’s and would have been the basis for nearly all civilian and commercial flight instruction in the period. While many have survived, few are in such readable condition as this. Most importantly, even in paperback form this copy is strong enough to sit on a bookshelf without excess slumping and deformation.