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Agriculture for Primary Schools. Pupils' Book 4

Musangi, RS; Keya, SO; Simiyu, P; Chembeni, B (University of Nairobi,, 1992)

Improvement And Utilization Of Rhizobium In African Agricultural Production

Keya, SO (University of Nairobi,, 1992)

Agriculture for Primary Schools. Pupils' Book 5

Musangi, RS; Keya, SO; Simiyu, P; Chembeni, B (University of Nairobi,, 1991)

Sci. Rev. Arid Zone 8,(51-108 pp),© Scientific Publishers, 1992

Dreyfus, BL; Diem, HS; Freire, J; Keya, SO; Dommergues, YR (University of Nairobi,, 1992)

Agriculture for Primary Schools. Pupils' Book 6

Musangi, RS; Keya, SO; Simiyu, P; Chembeni, B (University of Nairobi,, 1990)