Typed sheet "Pioneers of the Air – Setting New Standards in Air Speed!", signed by Jimmy Doolittle (world speed record 296.287 mph, 1932), Chuck Yeager (first to break the sound barrier, 1947) and Scott Crossfield (first at twice the speed of sound, 1953). Condition: clean.
This item will be accompanied by a Letter of Authenticity from One of a Kind Collectibles.