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P. Monaghan, C. B. Shedden, K. Ensor, C. R. Fricker, R. W. A. Girdwood, Salmonella Carriage By Herring Gulls in the Clyde Area of Scotland in Relation to Their Feeding Ecology, Journal of Applied Ecology, Vol. 22, No. 3 (Dec., 1985), pp. 669-679
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Monaghan et al. (1985) studied this question.
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