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Smaling, E.M.A., Nandwa, S.M. and Janssen, B.H. (1997) Soil Fertility in Africa Is at Stake. In: Buresh, R.J., Sanchez, P.A. and Calhoun, F., Eds., Replenishing Soil Fertility in Africa, Soil Science Society of America, Madison, WI, 47-61.

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