Charles J. Henny, Mitchell A. Byrd, Joseph A. Jacobs, Paul D. McLain, Michael R. Todd, Bernard F. Halla, Mid-Atlantic Coast Osprey Population: Present Numbers, Productivity, Pollutant Contamination, and Status, The Journal of Wildlife Management, Vol. 41, No. 2 (Apr., 1977), pp. 254-265
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Henny et al. (1977) studied this question.
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