Human activity and environmental processes / 
edited by K. J. Gregory and D.E. Walling 
 - New York :  John Wiley & Sons,  1987 
 - xiv, 466 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0471912131 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical geography<br/>Man--influence on nature