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Christopher L. Rowe, Owen M. Kinney, Justin D. Congdon, Oral Deformities in Tadpoles of the Bullfrog (Rana catesbeiana) Caused by Conditions in a Polluted Habitat, Copeia, Vol. 1998, No. 1 (Feb. 3, 1998), pp. 244-246
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Rowe et al. (1998) studied this question.
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