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David W. Kuehn, Todd K. Fuller, L. David Mech, William J. Paul, Steven H. Fritts, William E. Berg, Trap-Related Injuries to Gray Wolves in Minnesota, The Journal of Wildlife Management, Vol. 50, No. 1 (Jan., 1986), pp. 90-91
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Kuehn et al. (1986) studied this question.
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