TY JOUR TI THE STUDY OF CHEMICAL NATURE OF HUMIC ACIDS OF PEAT STRATIGRAPHIC COLUMN OF THE FIELD HOSPITAL OF MUKHRINO (KHANTY-MANSI AUTONOMOUS REGION - YUGRA) KW humic acids KW elemental analysis KW stratigraphy of peat deposits KW Mukhrino KW middle tai-ga KW Western Siberia JO Bulletin of KSAU AU Osnitsky, E.M. AU Sartakov, M.P. AU Zarov, E.A. AU Deryabina, Y.M. AU Timshina, M.A. PY 2017 IS PB Krasnoyarsk State Agrarian University