Papers presented and discussions held. 

 - Washington :  Pan American Health Organization, Pan American Sanitary Bureau,  1960. 
 - Pan American Sanitary Bureau. Scientific publication no. 50 .
 - Publicaciones cientificas (Washington, D.C.) ;  no. 50. .
<br/><br/> On cover: Live poliovirus vaccines.  "Sponsored by the Pan American Health Organization and the World Health Organization, with the cooperation of the Sister Elizabeth Kenny Foundation." 
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>68002822 //r863 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Poliomyelitis vaccine -- Congresses.--Poliomyelitis vaccine -- Congresses.
<br/><br/><label>LC Class. No.: </label>RA10  / .P252 no. 50 
<br/><br/><label>Dewey Class. No.: </label>362.1/09181/3 s  614.5/49