. Murphy, G., and Twaddle, A.A. (1986). Techniques for the assessment and control of log value recovery in the New Zealand forest harvesting industry. IN Improving productivity through forest engineering: Proceedings of the 9th Annual Council on Forest Engineering. September 29-October 2, 1985. 25p.
. Seymouret, R.S., Hannah, P.R., Grace, J.R., and Marquis, D.A. (1986). Silviculture: The next thirty years, the past thirty years. Journal of Forestry, (6): 31–38.
. Boston, k., and Dysart, G. (2000) .A comparison of felling techniques on sump height and log damage with economic interpretations. Western Journal of Applied Forestry, 15(3): 59–61.
. Gallagher, T.V., Shaffer, R.M., and Stuart, W.B. (1985). An assessment of shear damage to southern pine sawlogs. Forest Products Journal, 35(11/12): 87–91.
. Greene, W.D., and McNeel, J.F. (1989). Potential costs of shear damage in a southern pine chip-n-saw mill. Forest Products Journal, 39(5): 12–18.
. Shaffer, R.M., Swiatlo, J.A., Stuart, W.B., and Wengert, E.M. (1990). An analysis of shear damage at two southern pine sawmills. Forest Products Journal, 40(6): 33–36.
. Greene, W.D., and McNeel, J.F. (1987). Productivity, costs, and levels of butt damage with a Bell Model T feller-buncher. Forest Products Journal, 37(11/12): 70–74.
. Middleton, G.R., and Munroe, B.D. (1987). Evaluating two methods of coping with tree shear damage at the sawmill. Forest Products Journal, 37(7/8): 17–22.
. Sessions, J. (1988). Making better tree-bucking decisions in the woods. Journal of Forestry, (10): 43–45.
. Sarikhani, N. (1972). The amount of wood waste during logging operations in Iranian forests in different work conditions. Faculty of Natural Resources publication, No. 3, Tehran Univ. 30p.
. Emadi, S. (1997). Determining of wood waste in different stages of logging process, M.Sc. thesis. Faculty of Natural Resources, Tarbiat Modares University. 91p.
. Tavankar, F., and Einollahy, Y. (2010). Logging in northern forests of Iran. Asian Journal of Chemistry,22(2):1615–1618.
. Keivan Behjou, F., Majnounian, B., Namiranian, M., Saeed, A., and Feghhi, J. (2010). Determination of Volume and Value Loss in Logging Operations. Journal of Forest and Wood Products, 63(3): 299–304.
. Etehadi Abari, M. (2010). Quantitative and qualitative of wood loss following motor-manual tree felling. M.Sc. Seminar 1. Faculty of Natural Resources, Tehran University. 50p.
. Pearce, J.K., and Stenzel, G. (1972). Logging and Pulpwood Production. The Ronald Press Co. New York. 453p.
. Soleimanzade, E. (1987). Appropriate stump height to reduce waste during felling operation in the forest of beech and hornbeam trees. Research Institute of Forests and Rangelands. Technical Publication No. 48. Tehran. 46p.
. Soltaninejad, M. (1990). Phenomenon of provide lumber and cutting waste and wood Extraction in Traditional logging in forest kheyrud noshahr. M.Sc. thesis. Faculty of Natural Resources, Tarbiat Modares University. 157p.
. Vanderberg, M.R. (2002). Harvested log damage and value loss associated with two ground-based harvesting systems in central Appalachia. MSc. Thesis. Davis College of Agriculture, Forestry, and Consumer Sciences. West Virginia University. Morgantown, West Virginia. 98p.
. Gerasimov, Y., and Seliverstov, A. (2010). Industrial Round-Wood Losses Associated with Harvesting Systems in Russia. Croatian Journal of Forest Engineering, 31(2): 111–126.
. Anonymous, (2000). Forest management plan of Namkhaneh District, Kheyrud Educational and Research Forest in Nowshahr. Natural Recourses Faculty. University of Tehran. 360p.