References

References
Behler, J. & King, F. (1979). The Audubon Society field guide to North American reptiles and amphibians. New York: A. Knopf.
Behler
The Audubon Society field guide to North American reptiles and amphibians
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Conant, R. (1975). A field guide to reptiles and amphibians of eastern and central North America. Boston: Houghton Mif- flin.
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Dowling, H. New York University, Field Course in Zo- ology, (Course G23.1090).
Kauffeld, C. (1969). Snakes: The keeper and the kept. New York: Doubleday.
Kauffeld
Snakes: The keeper and the kept
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Stebbins, R. (1966). A field guide to western reptiles and am- phibians. Boston: Houghton Mifflin.
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