Charles, Enid. <br/><br/>
The menace of under-population:  a biological study of the decline of population growth ... / 
by Enid Charles ... 
 - London:  Watts & co.,,  1936. 
 - vii, 226 p. :  diagrs.;  20 cm. 
<br/><br/> "Originally issued under the title of "The twilight of parenthood."" 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Population.<br/>Birth control.<br/>Vital Statistics.
<br/><br/><label>Dewey Class. No.: </label>312