Work of who virus reference centres and the services they provide  
/ World Health Organization 
 - Geneva:    World Health Organization,      1968 
 - 59p. 
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>Subjects--Index Terms: </label>Environment 
<br/><br/><label>Universal Decimal Class. No.: </label>616.988:061.6  / K8