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Williams, J. S. (1931). Appendix II. The Pelecypoda of the Louisiana limestone. In: Bienniel Report of the State Geologist, Missouri Bureau of Geology and Mines, pp. 132-145, pl. 1.
Williams, J. S. (1931). Appendix II. The Pelecypoda of the Louisiana limestone. In: Bienniel Report of the State Geologist, Missouri Bureau of Geology and Mines, pp. 132-145, pl. 1.