Kirke A. King, Charles J. Stafford, Brian W. Cain, Allan J. Mueller, H. Dale Hall, Industrial, Agricultural, and Petroleum Contaminants in Cormorants Wintering near the Houston Ship Channel, Texas, USA, Colonial Waterbirds, Vol. 10, No. 1 (1987), pp. 93-99
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King et al. (1987) studied this question.