Childcraft. 

 - Chicago :  Childcraft,  c 1993. 
 - Vols. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>V. 9- Science at work ;  
<br/><br/>   
<br/><br/><label>ISBN: </label>0-7166-6007-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia. 
<br/><br/><label>Dewey Class. No.: </label>808.8 / C436