J. F. Dormaar, A. Johnston, S. Smoliak, Seasonal Variation in Chemical Characteristics of Soil Organic Matter of Grazed and Ungrazed Mixed Prairie and Fescue Grassland, Journal of Range Management, Vol. 30, No. 3 (May, 1977), pp. 195-198
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Dormaar et al. (1977) studied this question.
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