1. The variability of the permeability constant at low hydraulic gradients during saturated water flow in soils;Bodman;Soil Sci. Soc. Amer. Proc.,1938
2. Mean effect of pore size and clay migration during water percolation in soils;Bodman;Soil Sci. Soc. Amer. Proc.,1938
3. Duley , F. L. Estimating the amount of crop residue on a field, Air. Handbook 136 U.S. Department of Agriculture 1958
4. Effect of soil type, slope, and surface conditions and intake of water;Duley;Nebr. Agr. Exp. Sta. Res. Bull.,1939
5. Koon , J. L. Some effects of soil surface cover on infiltration Auburn, Alabama 1968