TY JOUR TI FORESTRY EFFICIENCY OF THE PROLONGED-GRADUAL CUTTING IN THE VOLOGDA REGION KW prolonged-gradual cutting KW the method of tree selection for cutting KW cutting intensity KW forest stand condition KW forest element safety KW growth energy JO Bulletin of KSAU AU Druzhinin, F.N. AU Pestovskiy, A.S. PY 2014 IS PB Krasnoyarsk State Agrarian University