Thresholds in geomorphology / 
edited by Donald R. Coates [and] John D. Vitek. 
 - London :  Allen & Unwin,  c1980. 
 - xii, 498 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0045510334 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomorphology--Congresses.