Ehrlich, Paul R. <br/><br/>
The machinery of nature / 
Paul R. Ehrlich. 
 - New York, N.Y. :  Simon & Schuster,  1986. 
 - 320 p. : 
<br/><br/><label>ISBN: </label>0671492888 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.