Singer, Fred S. <br/><br/>
Is there an optimum level of population?. 

 - New York :  Mc Graw-Hill Book Co.,  1971. 
<br/><br/> The publication dicusses whether there is an optimum number of people. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Population.<br/>Population size -- Population density -- Population.--Population size -- Population density -- Population.--Population size -- Population density -- Population.