Wald N <br/><br/>
Epidemiological approach 

 - 4th ed. 
 -  2004 
 - 86p.  NO 
<br/><br/><label>ISBN: </label>9781853155840 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Epidemiology
<br/><br/><label>Dewey Class. No.: </label>614.5  / WAL