Tivy, Joy. <br/><br/>
Human impact on the ecosystem / 
Joy Tivy, Greg O'Hare 
 - Edinburgh :  Oliver & Boyd,  1981 
 - 243 p. :  ill. ;  24 cm. 
 - Conceptual frameworks in geography .
<br/><br/>Includes bibliographical references (p. 227-235) and index 
<br/><br/><label>ISBN: </label>0050034243 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Man--influence on nature.