1. Aird P. L. and Stone E. L., Soil characteristics and the growth of European and Japanese larch in New York. J. Forestry 53, 425–429 (1955).
2. Baril, R. W., Les régions pédologiques du Québec. Annuaire du Québec. 54–56 (1971).
3. Choinière, L., Etude pédologique du comté de Drummond, Qué, Min. Agr. Div. Sols Bull. Tech.7. 167 p. (1960).
4. Dahl E.et al. , Soil factors and the Growth of Scotsch pine: a statistical re-interpretation of data presented by Viro (1955). Soil Sci. 92, 367–371 (1961).
5. Ezekiel M. and Fox K. A., Methods of Correlation and Regression Analysis. 3rd. Ed., John Wiley and Sons, New York. 548 p. (1959).