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Tan Ying Chiu, . and Marcus Jopony, . Chemical characterisation of Podzols in Sabah East Malaysia. pp. 59-63. ISSN 0126-6128
Marcus Jopony, . Paraquat adsorption characteristics of some Malaysian soils. pp. 119-124. ISSN 0126-6128
Zulkifli bin Usof, . and Marcus Jopony, . (1998) Phosphate adsorption-desorption characteristics of selected soils under oil palm cultivation in Sabah. [Proceedings Paper]