Papers presented and discussions held.   

 - Wishinfton, D.C. :   Pan American Sanitary Bureau ,   1960. 
 - xv, 634 p. :    ill. 
 - Pan American Health Organasation. Scientific Publication ;   50. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Poliovirus Vaccine--prevention------<br/>Poliomyelitis --prevention------
<br/><br/><label>National Library of Medicine Call No.: </label>WC 555   /  In8c 1960