00282nam a2200109Ia 450000500170000008000190001724500580003626000240009430000150011858300190013365000200015220260716043740.0  a15.05.01 W9271  aThe selection and use of essential medicines : report  bWHOaGenevaCHc2004  avi, 127 p.  c10/31/06kJOYD  aESSENTIAL DRUGS