1. Tree performance, soil plant-litter characteristics and faunal activity in some tropical plantations;Akinnifesi,2002
2. Acacia mangium: a historical perspective on its cultivation;Arisman,2006
3. Aluminum;Bertsch,1996
4. Nitrogen fixation in tropical forest plantations;Binkley,1997
5. Soil Chemistry (A) Basic Elements;Bolt,1976