Lee, Wallace, and George H. Girty. “Subsurface Mississippian Rocks of Kansas With Report on Fossils of Mississippian Age from Well Cores in Western Kansas”. Bulletin (Kansas Geological Survey), no. 33 (January 1, 1940): 1–114. Accessed December 30, 2025. https://journals.ku.edu/kgsbulletin/article/view/21905.