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 Robert T. Hatt, "Faunal and Archaeological Researches in Yucatan Caves," Cranbrook Institute of Science, Bulletin 33, 1953. See Peter J. Schmidt, "La entrada del hombre a la peninsula de Yucatan," in Origines del Hombre Americano, comp. Alba Gonzalez Jacome (Mexico: Secretaria de Educacion Publica, 1988), 250.