In the middle of one of the pages is Wilbur’s well-done overhead view of Kill Devil Hills on the coastline where the brothers experimented for three years up to their successful, history-making flight on December 17, 1903. A drawing very similar to this was included as a frontispiece of Fred Kelly’s Miracle at Kitty Hawk. Further research provided by the Smithsonian’s National Air and Space Museum indicates the airfield diagram done by Wilbur is of the Huffman Prarie flying field where the Wrights flew in 1904–5 and eventually established their flying school in 1910. The railroad tracks at the top are the Dayton, Springfield, Urbana interurban line, and the two intersecting roads are still there today. The entire area is now part of Area A of the Wright-Patterson Air Force Base in Dayton, Ohio. The remaining sketches are marvelous examples of the brothers’ understanding of aeronautics detailing wing construction and what appear to be flight patterns based upon design. While letters of instruction from the brothers are offered occasionally, actual diagrams are virtually non-existant. An incredibly rare first-hand example from the inventors of modern flight, including an image from their first successful flight. Pre-certified John Reznikoff/PSA/DNA and RR Auction COA.