Nikolsky, Alexander A. <br/><br/>
Helicopter analysis / 
Alexander A. Nikolsky 
 - London :  Chapman & Hall,  c 1951. 
 - xi, 340 p. :  ill. ;  24 cm. 
<br/><br/> Includes index.  
<br/><br/>79  79 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Helicopters.<br/> Other branches of engineering.
<br/><br/><label>Dewey Class. No.: </label>629.1335 / N589h