[Microbiological studies in sewage after purification using sand and grid filters].
D005374:Filtration / Q000295:instrumentation; D012722:Sewage / Q000032:analysis*; D014871:Water Microbiology; D014881:Water Supply / Q000032:analysis
D012722:Sewage
Mikrobiologicheskie issledovaniia pri doochistke stochnykh vod na kvartsevykh i karkasno-zasypnykh fil'trakh.