Zahm, Albert Francis <br/><br/>
The 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, 1915  [electronic resource] / 
Albert Francis Zahm 
 -  Project Gutenberg,  2013 
 - Project Gutenberg  44466 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text