TY JOUR TI The main principles and results of pollution monitoring of sediments in the river basin KW monitoring KW water objects KW thechnogenical factors KW heavy metals KW sediments KW urban zones KW areas of various categories JO Melioration and Water Management AU Korzhenevsky, B.I. AU Tolkachev, G.Y. AU Kolomiycev, N.V. PY 2020 IS 2019 PB ANO Editorial Board Melioration and water management