Statistical sources: Vital statistics 

 - Milton Keynes  Open University  1978 
 - 63p. 
<br/><br/><label>ISBN: </label> UKP 2.75 
<br/><br/><label>Source: </label> UKP 2.75 
<br/><br/><label>Dewey Class. No.: </label>310 STA