1. C. E. Hale , 1950 . Some observations on soil freezing in forest and range lands of the Pacific Northwest . U.S. Forest Service Pacific Northwest Forest and Ranger Experiment Station, Research Note 66, pp.1 -17 .
2. G. Hart, R. E. Leonard, and R. S. Pierce , 1962 . Leaf fall, humus depth, and soil frost in a northern hardwood forest . U.S. Forest Service Northeastern Forest and Ranger Experiment Station, Research Note 131, 3 pp.
3. Infiltration, overland flow, and soil movement on frozen and snow-covered plots
4. Estimating Soil Permeability Rates
5. Infiltration and runoff during the snow-melting season, with forest-cover