This is an exceptional and rare lot. "The X-20A Dyna-Soar (Dynamic Soarer) was a single-pilot manned reusable spaceplane, the earliest American manned space project to result in development contracts. It evolved from the German Saenger-Bredt Silverbird intercontinental skip-glide rocket bomber. Walter Dornberger, former head of Peendmuende, was at Bell Aircraft in the 1950's and developed the Sanger-Bredt concept through various iterations (Bomi and Robo). In typical Pentagon fashion the final development contract went instead to Boeing. Politics resulted in its primary purpose changing during its life (manned space bomber, high speed test vehicle, reconnaissance platform), with the launch vehicles at various times including Titan I, Titan II, and finally Titan IIIC. Cancellation in December 1963 came only eight months before drop tests from a B-52 and a first manned flight in 1966. After its cancellation, the Air Force pursued further development of manned spaceplanes through the Prime, Asset, X-23, and X-24 programs, with suborbital launch of subscale lifting body designs." (Source: Encyclopedia Astronautica) This one-carton lot is chock-full of X-20A documents, photographs and memorabilia. Just a sample of the treasures included are: glass slides of the proposed space craft, black (8x10") photographs of the astronaut candidates performing in simulators, autographed photographs of the X-20 pilots, RARE X-20 tie tac, ORIGINAL typed memoranda on astronaut selection criteria, and much, much more. This is an absolute 'must see' to appreciate.