1. Soil Mapping and Soil Characterization Studies in the Zaria Area;Awujoola,1979
2. Soils of the West African Savanna;Jones,1975
3. Energy load and instantaneous intensity of rainstorms at Samaru, northern Nigeria;Kowal;Trop. Agric. (Trinidad),1976
4. Rainfall conservation and the yield of sorghum and groundnuts in northern Nigeria;Lawes;Exptl. Agric.,1966
5. Classification of northern Nigeria soils in terms of the legend of the soils map of Africa;Tomlinson;Afr. Soils,1964