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Harding, J.H.; Mifsud, D.A. 2017 Amphibians and Reptiles of the Great Lakes Region. 2nd rev. ed. University of Michigan Press, Ann Arbor. 424 pp.

Harding, J.H. 1997 Amphibians and reptiles of the Great Lakes region. University of Michigan Press, Ann Arbor. 378 pp.