H. F. Mayland, A. R. Florence, R. C. Rosenau, V. A. Lazar, H. A. Turner, Soil Ingestion by Cattle on Semiarid Range as Reflected by Titanium Analysis of Feces, Journal of Range Management, Vol. 28, No. 6 (Nov., 1975), pp. 448-452
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Mayland et al. (1975) studied this question.
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