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Gravell, D. W.; Hanna, M. A. (1937). The Lepidocyclina texana horizon in the Heterostegina zone, upper oligocene, of Texas and Louisiana. Journal of Paleontology. 11(6): 517-529.
Gravell, D. W.; Hanna, M. A. (1937). The Lepidocyclina texana horizon in the Heterostegina zone, upper oligocene, of Texas and Louisiana. Journal of Paleontology. 11(6): 517-529.