Ahnstrom, D. N. <br/><br/>
The complete book of helicopters / 
D N Ahnstrom 
 - 1st ed. 
 - Cleveland :  World Pub. Co.  1954 
 - 160 p. :  ill. ;  29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Helicopters.
<br/><br/><label>Dewey Class. No.: </label>629.133352  / AHC 1954