Green, R.A., Monlux, A.W. and Randolph, T.C. 1973. Blood porphyrin determination: A rapid field test for lead poisoning in cattle. The Bovine Practitioner. 1973, 8 (Nov. 1973), 30–35. DOI:https://doi.org/10.21423/bovine-vol1973no8p30-35.