Thornbury, William D.  1900- <br/><br/>
Principles of geomorphology / 
William D. Thornbury. 
 - 2nd ed. 
 - New York :  Wiley,  1969. 
 - xi, 594 p. :  illus., maps. ;  23 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science
<br/><br/><label>Dewey Class. No.: </label>551.41