Barry R. Koffler, Richard A. Seigel, Mary T. Mendonca, The Seasonal Occurrence of Leeches on the Wood Turtle, Clemmys insculpta (Reptilia, Testudines, Emydidae), Journal of Herpetology, Vol. 12, No. 4 (Oct. 30, 1978), pp. 571-572
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Koffler et al. (1978) studied this question.