title: [Sewage purification in populated rural areas].
mesh_terms: D012423:Rural Health; D012498:Sanitary Engineering / Q000295:instrumentation / Q000379:methods*; D012722:Sewage; D014586:USSR
chemical_list: D012722:Sewage
vernacular_title: Ochistka stochnykh vod sel'skikh nasellennykh mest