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1967
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Milstead, William W. Fossil box turtles (Terrapene) from central North America, and box turtles of eastern Mexico. Copeia 1967(1):168-179
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2001
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Dodd, C. Kenneth, Jr. North American Box Turtles: A Natural History. University of Oklahoma Press, Norman. pp.
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2012
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Joyce, Walter G., Andrea Petricevic, Tyler R. Lyson, and Nicholas J. Czaplewski. A new box turtle from the Miocene/Pliocene boundary (Latest Hemphillian) of Oklahoma and a refined chronology of box turtle diversification. Journal of Paleontology 86(1):177-190
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2018
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Vlachos, Evangelos. A review of the fossil record of North American turtles of the clade Pan-Testudinoidea Bulletin of the Peabody Museum of Natural History 59(1):3-94
Has a BUNCH of changes to turtle taxonomy that need to be incorporated.
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