Biological components of human reproduction : studies of their variations in population groups, report of a WHO scientific group [meeting held in Geneva from 10 to 16 December 1968]. 

 - 41p. 
 - (WHO technical report series ; 435) .
<br/><br/><label>ISBN: </label>92-4-120435-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reproduction<br/>Epidemiologic methods<br/>Population