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V. S. Baron, A. C. Dick, E. Mapfumo, S. S. Malhi, M. A. Naeth, D. S. Chanasyk, Grazing Impacts on Soil Nitrogen and Phosphorus under Parkland Pastures, Journal of Range Management, Vol. 54, No. 6 (Nov., 2001), pp. 704-710
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Baron et al. (2001) studied this question.
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