Spencer, Edgar W. <br/><br/>
Earth science :  understanding environmental systems / 
Edgar W. Spencer 
 - Boston :  McGraw-Hill,  2003 
 - 518 p. :  col. ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>0072341467 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth sciences