Spencer, Edgar W. <br/><br/>
Earth Science Understanding Environmental Systems / 
Edgar W. Spencer 
 - Boston :  Mc Graw Hill,  2003 
 - xxi, 518p. :  ill., col. ;  30 cm 
<br/><br/><label>ISBN: </label>0072341467 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth Sciences
<br/><br/><label>Dewey Class. No.: </label>550 SPE