Ehrlich P R, Ehrlich A.H. <br/><br/>
Population resources, environment : issues in human ecology. 

 - 509p. 
 - (A series of books on biology). .
<br/><br/><label>ISBN: </label>0-7167-0695-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Population<br/>Environment<br/>Ecology
<br/><br/><label>LC Class. No.: </label>2nd ed.