005820000a22001930004500003000900000005001700009100004600026710006800072245006700140562001800207264004900225300000900274041000800283650002000291650001900311650002000330650002500350650001300375PH-MaWHO20241108112249.0  aNazerali H, Muchemwa T, Hogerzeil Hans V.  aWorld Health Organization. Action Programme on Essential Drugs.  aStability of essential drugs in tropical climates :bZimbabwe.  aWHO/DAP/94.16  aGeneva : bWorld Health Organization,c1996.  a77p.  aeng  aEssential drugs  aDrug stability  aQuality control  aLongitudinal studies  aZimbabwe