1. Soil moisture measurement;Lull,1955
2. Influence of soil variability on soil moisture and strength predictions;Molthan;U.S.A.E. Waterways Exp. Sta. (Working Draft),1966
3. Variability of soil chemical properties in two uncultivated brown earths;Ball;J. Soil Sci.,1968
4. Soil moisture sampling plan for watersheds;McGuinness;U.S. Dept. Agric., Agric. Res. Serv.,1964
5. An evaluation of errors associated with soil testing;Gallagher;Irish J. Agric. Res.,1963