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Jibba, K.B.; Duvel, G.H. (Gustav Heinrich)(South African Society for Agricultural Extension, Department of Agriculture, Ecomomics, Extensions and Rural Development, University of Pretoria, 2008)
Midega, C.A.O.; Khan, Z.R.; Van den Berg, J.; Ogol, C.K.P.O.; Dippenaar-Schoeman, Anna S. (Anna Sophia), 1948-; Pickett, J.A.; Wadhams, L.J.(Blackwell, 2008)
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