00430 a2200145 4500020001500000082001700015245009500032250001200127260005000139300002000189650001500209650001900224650001800243650002300261 a9241545356 a572.539bGUI aGuidelines for drinking-water qualitybaddendumb microbiological agents in drinking water a2nd ed. aGenevabWorld Health Organizationc2002g2002 avii,142p.c24cm aGuidelines aDrinking Water aWater Quality awater Microbiology