TY JOUR TI Calculation of specific labor costs of two technological processes of preparation of assortments KW specific expenditures of labour KW forest machines KW efficiency of production JO Actual directions of scientific researches of the XXI century: theory and practice AU Kolominova, M.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov