Tivy, Joy O'Hare, Greg <br/><br/>
Human impact on the ecosystem 

 - Edinburgh  Oliver & Boyd  1981 
 - 243p.  PB  22 cm. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Nature--Effect of human beings on<br/>Human ecology
<br/><br/><label>Dewey Class. No.: </label>577.27  / TIV