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David K. Delaney, Teryl G. Grubb, Paul Beier, Larry L. Pater, M. Hildegard Reiser, Effects of Helicopter Noise on Mexican Spotted Owls, The Journal of Wildlife Management, Vol. 63, No. 1 (Jan., 1999), pp. 60-76
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Delaney et al. (1999) studied this question.
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