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1972
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1975
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Montanucci, Ricahrd R., Ralph W. Axtell, and Herbert C. Dessauer. Evolutionary divergence among collared lizards (Crotaphytus), with comments on the status of Gambelia. Herpetologica 31:336-347
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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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1996
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McGuire, Jimmy A. Phylogenetic systematics of crotaphytid lizards (Reptilia: Iguania: Crotaphytidae). Bulletin of the Carnegie Museum of Natural History 32:iv + 1-143
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2007
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McGuire, Jimmy A., Charles W. Linkem, Michelle S. Koo, Delbert W. Hutchison, A. Kristopher Lappin, David I. Orange, Julio Lemos-Espinal, Brett R. Riddle, and Jef R. Jaeger. Mitochondrial introgression and incomplete lineage sorting through space and
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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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