1. The engineering classification of some western Nigerian soils and their qualities in road making;Ackroyd;Brit. Road Res. Lab., Overseas Bull.,1959
2. Notes on the crushing strength of some western Nigerian concretionary gravels and their selection for use as a building material;Ackroyd;Min. Transp. Ibadan, Western Nigeria, Tech. Pap.,1960
3. The correlation between engineering and pedological classification systems in western Nigeria and its implications;Ackroyd,1963
4. Formation and properties of concretionary and non-concretionary soils in western Nigeria;Ackroyd,1967
5. Notes on the application of linear shrinkage test to the selection of western Nigeria gravel soils;Ackroyd;Ministry Works Transp., Ibadan, Western Nigeria, Tech. Pap.,1960