Christopherson, Robert W. <br/><br/>
Elemental geosystems / 
Robert W. Christopherson ; in collaboration with Ginger Birkeland. 
 - 7th ed. 
 - Boston :  Pearson,  2013. 
 - xxi, 531, [39] p. :  col. ill., col. maps ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9780132940412 (pbk.)  RM396.26 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical geography.