Joseph L. Moore, William L. Hohman, Timothy M. Stark, Gary A. Weisbrich, Shot Prevalences and Diets of Diving Ducks Five Years after Ban on Use of Lead Shotshells at Catahoula Lake, Louisiana, The Journal of Wildlife Management, Vol. 62, No. 2 (Apr., 1998), pp. 564-569
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Moore et al. (1998) studied this question.
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