title: [EXPERIENCE IN IMPROVING THE SANITARY STATE OF THE VELIKAYA RIVER IN THE BOUNDARIES OF PSKOV].
mesh_terms: D004957:Estonia; D045483:Rivers; D014586:USSR; D014876:Water Pollution; D014881:Water Supply
keywords: ESTONIA; USSR; WATER POLLUTION; WATER SUPPLY
vernacular_title: OPYT ULUCHSHENIIA SANITARNOGO SOSTOIANIIA REKI VELIKO I V CHERTE PSKOVA.