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James L. Detterline, James S. Jacob, Walter E. Wilhelm, A Comparison of Helminth Endoparasites in the Cottonmouth (Agkistrodon piscivorus) and Three Species of Water Snakes (Nerodia), Transactions of the American Microscopical Society, Vol. 103, No. 2 (Apr., 1984), pp. 137-143
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Detterline et al. (1984) studied this question.
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