1. Sulfur status and forms in some Ghanaian soils;Acquaye;Soil Sci.,1987
2. Micronutrient elements;Brady,1996
3. Soils of flood plains of West Africa: geographical and regional distribution of some fertility parameters;Buri,1996
4. Soils of flood plains in West Africa: general fertility status;Buri;Soil Sci. Plant Nutr.,1999
5. Nickel, copper, zinc, manganese and iron;Dale,1982