Charles, Enid. <br/><br/>
The menace of under-population :  a biological study of the decline of population / 
by Enid Charles. 
 - London :  Watts & Co.,  1936. 
<br/><br/> "Originally issued under the title of "The twilight of parenthood." 
<br/><br/><label>LCCN: </label>38001108 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Population.<br/>Birth control.<br/>Vital statistics.
<br/><br/><label>LC Class. No.: </label>HB871  / .C5 1937 
<br/><br/><label>Dewey Class. No.: </label>312