Papars presented and discussions held.   

 - Washington D.C. :   Pan American Sanitary Bureau. ,   1959. 
 - xiv, 713 p. :    diagrs. 
 - Pan American Sanitary Bureau. Scientific Publication ;   44. .
<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 1959