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1 Clay, W. L. 1938. A synopsis of the North American water snakes of the genus Natrix. Copeia 1938:173182.
2 Cliburn, J. W. 1960. The phylogeny and zoogeography of North American Natrix. Dissertation, University of Alabama, Tuscaloosa, Alabama, USA. 319pp.
3 Goff, C. C. 1936. Distribution and variation of a new subspecies of water snake, Natrix cyclopion floridana, with a discussion of its relationships. Occasional Papers of the Museum of Zoology, University of Michigan No. 327. 9pp.
4 Holman, J. A. 2000. Fossil snakes of North America: origin, evolution, distribution, paleoecology. Indiana University Press, Bloomington, Indiana, USA. 357pp.
5 Lawson, R. 1985. Molecular studies of Thamnophiine snakes. Dissertation, Louisiana State University, Baton Rouge, Louisiana, USA. 183pp.
6 Sanderson, W. E. 1983. Systematics of the water snakes of the Nerodia cyclopion complex. M.S. Thesis, Louisiana State University, Baton Rouge, Louisiana, USA. 103pp.
7 Sanderson, W. E. 1993. Additional evidence for the specific status of Nerodia cyclopion and Nerodia floridana (Reptilia, Colubridae). Brimleyana 19:8394.
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