00312nam a22001097a 4500082001500000100003500015245004200050250002000092260005000112300000700162650003300169  a632.95 PES  aInstitiute of chemistry ceylon  aPesticide Residues in the environment  aSeminar Reports  aColombobInstitiute of Chemistry Ceylonc2006  a35  aenvironmentaseminar reports