1. The fineness of solids;Andreasen,1939
2. Studies of some cracking clay soils in the Lake Chad basin of North East Nigeria;Beavington;J. Soil Sci.,1978
3. Aeolian deposition and soil parent materials in Northern Nigeria;Bennett;Geoderma,1980
4. Determination of total, organic, and available forms of phosphorus in soils;Bray;Soil Sci.,1945
5. Mineralogy and surface properties of the clay fraction affecting soil behavior and management;Brinkman,1985