P. R. Fresquez, Richard E. Francis, G. L. Dennis, Soil and Vegetation Responses to Sewage Sludge on a Degraded Semiarid Broom Snakeweed/Blue Grama Plant Community, Journal of Range Management, Vol. 43, No. 4 (Jul., 1990), pp. 325-331
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Fresquez et al. (1990) studied this question.
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