1. The engineering classification of some western Nigerian soils and their qualities in road making;Ackroyd;Road Res. Lab., Overseas Bull.,1959
2. The correlation between engineering and pedological classification systems in western Nigeria and its implications;Ackroyd,1963
3. Formation and properties of concretionary and non-concretionary soils in western Nigeria;Ackroyd,1967
4. The soils of Zuarungu Agricultural Station;Adu;Soil Land Use Surv. Div., Kumasi, Ghana, Tech. Rept.,1961
5. The soils of the Manga (near Bawku) Agricultural Station;Adu;Soil Land Use Surv. Div., Kumasi, Ghana, Tech. Rept.,1962