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1. The development of operational thinking in primary school children; an examination of some aspects of Piaget's theory among the Iteso children of Uganda.

by Otaala, Barnabas.

Material type: book Book; Format: print ; Literary form: Not fiction Publisher: New York, Teachers College Press [1973]Dissertation note: Thesis--Columbia University. Availability: No items available

2. The African child and his environment / editors, R. Ogbonna Ohuche and Barnabas Otaala, for the Science Education Programme for Africa (SEPA), with the assistance of the United Nations Environment Programme (UNEP).

by Ohuche, R. Ogbonna [editor] | Otaala, Barnabas [editor].

Publisher: Oxford : Pergamon Press Ltd., 1981Availability: Items available for loan: Main Library [Call number: HQ 792.A4 AFR 1981] (1).