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E. G. Cooch, D. B. Lank, R. F. Rockwell, F. Cooke, Long-Term Decline in Body Size in a Snow Goose Population: Evidence of Environmental Degradation?, Journal of Animal Ecology, Vol. 60, No. 2 (Jun., 1991), pp. 483-496
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Cooch et al. (1991) studied this question.
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