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Conant, R.; Collins, J.T. 1991 Reptiles and amphibians. Eastern/central North America. 3rd ed. Houghton Mifflin Co., Boston & New York, Peterson Field Guide Series no. 12. 450 pp.

Conant, R. 1975 A field guide to reptiles and amphibians of eastern and Central North America. 2nd ed. Houghton Mifflin, Boston. 429 pp.