ClassicsAërial Navigation - A Popular Treatise on the Growth of Air Craft and on Aëronautical MeteorologyAlbert Francis Zahm
ClassicsThe First Man-Carrying Aeroplane Capable of Sustained Free Flight: Langley's Success as a Pioneer in Aviation - From the Smithsonian Report for 1914, pages 217-222, Publication 2329, 1915Albert Francis Zahm
