Singer, S. Fred <br/><br/>
Is Ther an Optimum Level of Population ? 
/ by S. Fred Singer 
 - New York:  Mcgraw- Hill Book Company,  1971 
 - xiv, 426p.; 
<br/><br/><label>ISBN: </label>070574715 
<br/><br/><label>Dewey Class. No.: </label>301.32  / SIN/I