1. Soils of the Great Plains;Aandahl,1981
2. Reducing cattle numbers in Southern African Communal Range;Abel,1993
3. Spatial and seasonal variability of field measured infiltration rates on a rangeland site in Utah;Achouri;Journal of Range Management,1984
4. Soil Organic Matter and its Role in Crop Production;Allison,1973
5. Consequences to soil patterns and processes in Southern Africa following vegetation change associated with livestock management;Allsopp,1999