Soil disturbance and impacts on tree growth resulting from forestry operations in mountainous terrain. 1990. Smith, R.B.; Krag, R.K.; Senyk, J.P. Pages 113-126 in Proceedings of the seminar on the impact of mechanization of forest operations to the soil, September 11-15, 1989, Louvain-la-Neuve, Belgium. Ministry of Agriculture, Brussels.