Thorn, Colin E. <br/><br/>
An introduction to the theoretical geomorphology/ 
Colin E. Thorn 
 - London:  Unwin hyman,  1988. 
 - 247p. 
<br/><br/><label>ISBN: </label>978004551181 
<br/><br/><label>Dewey Class. No.: </label>551.4  / THO/I