Charles J. Henny, Lawrence J. Blus, Alexander J. Krynitsky, Christine M. Bunck, Current Impact of DDE on Black-Crowned Night-Herons in the Intermountain West, The Journal of Wildlife Management, Vol. 48, No. 1 (Jan., 1984), pp. 1-13
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Henny et al. (1984) studied this question.
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