Barker DJP&Hall AJ <br/><br/>
Practical Epidemiology 

 - 4th 
 -  Churchill Livingstone  1991 
 - 173pgs 
 - Epipemiology 
<br/><br/><label>ISBN: </label>0 443 04424 4 
<br/><br/><label>Nat. Bib. No.: </label>002180 
<br/><br/><label>Dewey Class. No.: </label>616-036.22 B16