00459cam a2200169 a 4500020002300000040000800023082002600031110003000057245004200087250001100129260003900140300001800179500003600197650001900233650001700252650002000269  a9241544600 (v.1) :  cDLC00a363 WOR 1993 C153 Or.2 aWorld Health Organization10aGuidelines for drinking-water quality  a2nd ed  aGeneva :bThe Organization,c1993-  a3 v. ;c24 cm  aUpdated periodically by addenda 0aDrinking water 2aWater Supply 2aWater Pollution