Gallie, Karmie O., and Wanda N. Waught. “Compositional Variance in the Plattsmouth Limestone Member (Pennsylvanian) in Kansas”. Bulletin (Kansas Geological Survey), no. 180 (January 1, 1966): 1–9. Accessed January 3, 2026. https://journals.ku.edu/kgsbulletin/article/view/22204.