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Harlan, L.R. (1834). "Notice of Fossil Bones Found in the Tertiary Formation of the State of Louisiana". Transactions of the American Philosophical Society. 4: 397–403. doi:10.2307/1004838. JSTOR1004838.
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Zollner, Douglas; MacRoberts, Michael H.; MacRoberts, Barbara R.; Ladd, Douglas (2005). "Endemic Vascular Plants of the Interior Highlands, U.s.a". SIDA, Contributions to Botany. 21 (3): 1781–1791. ISSN0036-1488. JSTOR41968453.