Sheldon, William,  -1871. <br/><br/>
Aerial navigation and the patent laws. 
By William Sheldon ... 
 - Boston,  Thurston, Torrey, & Company,  1850. 
 - 46 p.  illus., diagrs.  24 cm. 
<br/><br/><label>LCCN: </label>po 29000247  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Flight.<br/>Aeronautics.<br/>Patent laws and legislation.
<br/><br/><label>LC Class. No.: </label>TL544  / .S544