Ronald J. Brooks, Margaret A. Krawchuk, Cameron Stevens, Nicola Koper, Testing the Precision and Accuracy of Age Estimation Using Lines in Scutes of Chelydra serpentina and Chrysemys picta, Journal of Herpetology, Vol. 31, No. 4 (Dec., 1997), pp. 521-529
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Brooks et al. (1997) studied this question.
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