MACMAHON, B <br/><br/>
Influence of birth order and maternal age on the human sex ratio at birth.  [electronic resource] 

 -  British journal of preventive & social medicine  Apr 1953 
 - 83-6 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0007-1242 
<br/><br/><label>Standard No.: </label>10.1136/jech.7.2.83  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Birth Order<br/>Family<br/>Female<br/>Fetus<br/>Humans<br/>Maternal Age<br/>Parturition<br/>Pregnancy<br/>Sex Ratio