Craig R. McLaughlin, George J. Matula, Jr., Randal A. Cross, William H. Halteman, Mark A. Caron, Karen I. Morris, Precision and Accuracy of Estimating Age of Maine Black Bears by Cementum Annuli, Bears: Their Biology and Management, Vol. 8, A Selection of Papers from the Eighth International Conference on Bear Research and Management, Victoria, British Columbia, Canada, February 1989 (1990), pp. 415-419
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McLaughlin et al. (1990) studied this question.
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