Ehrlich Paul R and others <br/><br/>
Ecoscience    Population , Resources , environment.    

 - 2 
 - America  W.H.Freeman and Company          1977 
 - xv,1051p  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5, L0;L7