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	1.	The African child and his environment / editors : R. Ogbonna Ohuche, Barnabas Otaala with the assistance of the United Nations Environment Programme (UNEP). by Ohuche, R. Ogbonna [editor.] Otaala, Barnabas [editor.] United Nations Environment Programme Science Education Programme for Africa Series: UNEP studies ; v.3Publisher: Oxford : Pergamon Press, 1981 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: HQ792.A4A43. Place hold
	2.	No cover image available The development of operational thinking in primary school children : an examination of some aspects of Piaget's theory among the iteso children ofUganda / Barnabas Otaala by Otaala, Barnabas Publication details: New York : Teachers College Press, 1973 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: LB775.P49O85[00008018862]. Place hold

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