1928
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Ortenburger, Arthur I. The whip snakes and racers: Genera Masticophis and Coluber. Memiors of the University of Michigan Museum (1):1-247
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1965
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Holman, J. Alan. Early Miocene anurans from Florida. Quarterly Journal of the Florida Academy of Sciences 28(1):68-82
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2012
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Martin, Carolina (Albaladejo), Borja Sanchiz, and Miguel Angel Alonso-Zarazaga. Nomenclatural notes on living and fossil amphibians. Graellsia 68(1):159-180
References Kansas specimens of Bufo hibbardi from Edson Quarry, Bufo pliocompactilis from WaKeeney, Bufo repentinus from Cragin Quarry, Bufo rexroadensis and Bufo suspectus from Fox Canyon, Bufo spongifrons from Long Island Quarry, and nine Rana from Rexroad.
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