1860
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Kennicott, Robert. Descriptions of new species of North American serpents in the Museum of the Smithsonian Institution, Washington Proceedings of the Academy of Natural Sciences, Philadelphia 12:328-338
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1903
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Brown, Arthur Edwin. The variations of Eutaenia in the Pacific subregion. Proceedings of the Academy of Natural Sciences, Philadelphia 55:286-297
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1908
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Ruthven, Alexander G. Variations and genetic relationships of the garter-snakes. Bulletin of the United States National Museum (61):1-201
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1985
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Lawson, Robin. Molecular studies of Thamnophiine snakes. Dissertation. Louisiana State University, Baton Rouge. 191pp.
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1993
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McGuire, Jimmy A. and L. Lee Grismer. The taxonomy and biogeography of Thamnophis hammondii and T. digueti (Reptilia: Squamata: Colubridae) in Baja California, Mexico. Herpetologica 49(3):354-365
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2002
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de Queiroz, Alan, Robin Lawson, and Julio A. Lemos-Espinal. Phylogenetic relationships of North American garter snakes (Thamnophis) based on four mitochondrial genes: How much DNA sequence is enough?. Molecular Phylogenetics and Evolution 22(2):315-329
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