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1954
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1968
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1969
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1970
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2000
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2004
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Pauly, Gregory B., David M. Hillis, and David C. Cannatella. The history of a Nearctic colonization: Molecular phylogenetics and biogeography of the Nearctic toads (Bufo). Evolution 58():2517-2535
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2005
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2008
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2013
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2016
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2017
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