Earth science : understanding environmental systems 
Spencer, Edgar W. 
 - 1st ed. 
 -  McGraw-Hill Companies.  2003 
 - xxi, 518 p. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth science.
<br/><br/><label>Dewey Class. No.: </label>550 S745 2003