A. B. Lutz-Garihan and R. J. Cuffey, “Stratigraphy of the Lower Permian Wreford Megacyclothem in Southernmost Kansas and Northern Oklahoma”, kgsbulletin, no. 216, pp. 1–19, Jan. 1979, Accessed: Jul. 22, 2024. [Online]. Available: https://journals.ku.edu/kgsbulletin/article/view/22266