Water :   global challenges & policy of freshwater use /  
National Geographic Learning. 
 - Canada; USA :  Cencage Learning,   2014. 
 - vii,143p.:col.photos; 26cm   
 - National Geographic Learning reader  .
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>Dewey Class. No.: </label>TR 574.52632 N21311 2014