Knight, Clayton <br/><br/>
The big book of real helicopters 

 - Canada:  Grosset   &Dunlap,  1955. 
 - 30p.;  Col. ill.;  28 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering
<br/><br/><label>Dewey Class. No.: </label>629.133352  / KNI