Headlam, Catherine <br/><br/>
Science encyclopedia - vol. 9  sonar - turtle 

 - New York  Kingfisher  1991 
 - 637 - 716p. : ill.  
<br/><br/> 10 volumes. 
<br/><br/><label>ISBN: </label>1856974553 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia -- Science<br/>Science -- Encyclopedia