Singer S Fred Ed. <br/><br/>
Is there on optimum level of population. 

 - New York  McGraw-Hill           1971 
 - xiii,426p  cm. 
<br/><br/> Bibliography at the end of each chapter; Appendix : P311-405 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5, L1