1. Affidavits in the United States District Court for the Western District of New York, of Robert L. Reed; Dr. Albert F. Zahm, 1914.
2. The Work of S. P. Langley. Bairstow L. . Journal Royal Aeronautical Society, November 1922.
3. The Wright-Brewer correspondence 1908-1947 (in possession of the Society).
4. The relations between the Smithsonian Institution and the Wright Brothers by Charles G. Abbot. Smithsonian Publication No. 2977, Washington, September 29 1928.
5. How we made our first flight. Orville Wright. Flying. The Aero Club of America Bulletin, December 1913.