TY JOUR TI LOCALIZATION OF LIQUIDATED DEEP WELLHEADS DEPENDING ON GEOMORPHOLOGICAL ZONING IN THE ASTRAKHAN REGION KW liquidated well KW Astrakhan region KW ecological monitoring KW geomorphology JO Vestnik of Astrakhan State Technical University AU Makarova, O.. PY 2014 IS 2014 PB Astrakhan State Technical University