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http://en.wikipedia.org/wiki/Gopherus_polyphemus.
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http://animaldiversity.org/accounts/Gopherus_polyphemus/.
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http://genomics.senescence.info/species/entry.php?species=Gopherus_polyphemus.
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Ernst, C. H. and Barbour, R. W. (1989).
Turtles of the world.
Smithsonian Institutiun Press, Washington.
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Kooijman, S. (2010).
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Mushinsky, J. H. R., Wilson, D. S., and McCoy, E. D. (1994).
Growth and sexual dimorphism of gopherus polyphemus in central
Florida.
Herpetologica, 50(2):119--128.