Smallpox and its eradication / 
Frank Fenner... [et al.]. 
 - 1460 páginas 
 - History of international public health ;  6. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Viruela--Control.
<br/><br/><label>Dewey Class. No.: </label>614.521  / S635 1988