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Myers, R. L. (1968). Biostratigraphy of the Cardenas Formation (Upper Cretaceous) San Luis Potosi, Mexico. Paleontología Mexicana. 24: 9-39, pls. 1-16.
Myers, R. L. (1968). Biostratigraphy of the Cardenas Formation (Upper Cretaceous) San Luis Potosi, Mexico. Paleontología Mexicana. 24: 9-39, pls. 1-16.