From the Centers for Disease Control and Prevention. Smallpox surveillance--worldwide. 1978.  [electronic resource] 

 -  JAMA  Jan 1998 
 - 190 p.  digital 
<br/><br/> Publication Type: Classical Article; Historical Article; Journal Article 
<br/><br/><label>ISSN: </label>0098-7484 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Global Health<br/>History, 20th Century<br/>Humans<br/>Smallpox--epidemiology