In forest areas where high soil erosion potential exists, a comparative yarding cost estimate, including the indirect costs determined by methods proposed here, shows that the total cost of using "advanced" logging methods may be less than that of "traditional" systems.
Klock, Glen O. 1976. Estimating two indirect logging costs caused by accelerated erosion. Gen. Tech. Rep. PNW-GTR-044. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 9 p