1. Upland Rice Improvement in West Africa;Abifarin,1972
2. West African Soils;Ahn,1970
3. Area and distribution;Andriesse,1986
4. Draft report on the agro-socio-economic survey of 2 sites in Sierra Leone;Ay,1984
5. Notice explicative de la carte géologique à 1:2,000,000 de l'Afrique occidentale;Barrere;Mem. Bur. Rech. Géol. Min.,1965