Grolier student encyclopedia:   economy - food chain. 

 - Danbury,CT :  Grolier,  2004. 
 - 64 pages 29cm. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>0-7171-5871-8 
<br/><br/><label>LC Class. No.: </label>030 G89