005300000a22001690004500003000900000005001700009110006800026245006700094562001700161264004900178490003600227300000900263041000800272650002000280650003700300650002300337PH-MaWHO20241108112248.0 aWorld Health Organization. Action Programme on Essential Drugs. aOperational research projects in DAP : an annotated inventory. aWHO/DAP/96.3 aGeneva : bWorld Health Organization,c1996. a(DAP research series ; no. 19). a88p. aeng aEssential drugs aOperations researchvDirectories aDatabases, Factual