...Sedimentary studies byHutchinson, Patrick, and Deevey (1956) and Sears, Foreman, and Clisby(1955) have provided evidence of drastic climatic shifts in Méxicoduring the Pleistocene...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
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