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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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1940
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Fitch, Henry S. A biogeographical study of the ordinoides artenkreis of garter snakes (genus Thamnophis). University of California Publications in Zoology 44:1-150
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1987
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Rossman, Douglas A. and G. R. Stewart. Taxonomic reevaluation of Thamnophis couchii (Serpentes: Colubridae). Occaisional Papers of the Museum of Zoology, Louisiana State University (63):1-25
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1991
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Collins, Joseph T. Viewpoint: A new taxonomic arrangement for some North American amphibins and reptiles Herpetological Review 22(2):42-43
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1994
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De Queiroz, Alan and Robin Lawson. Phylogenetic relationships of the garter snakes based on DNA sequence and allozyme variation. Biological Journal of the Linnean Society 53:209-229
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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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2014
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Crother, Brian I. The bold taxonomic hypotheses of Collins (1991): 23 years later. Herpetological Review 45(2):268-272
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2015
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Wood, Dustin A., Brian J. Halstead, Michael L. Casazza, Eric C. Hansen, Glenn D. Wylie, and Amy G. Vandergast. Defining population structure and genetic signatures of decline in the Giant Gartersnake (Thamnophis gigas): Implications for conserving threatened species within highly altered landscapes. Conservation Genetics 16:1025-1039
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