J. E. Sprinkle, D. D. Kress, D. E. Doornbos, D. C. Anderson, M. W. Tess, R. P. Ansotegui, B. E. Olson, N. J. Roth, Chromic Oxide Contamination of Pasture Previously Used in Marker Studies, Journal of Range Management, Vol. 48, No. 3 (May, 1995), pp. 194-197
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