Harbaugh, John W., and William Jr. Davie. “Upper Pennsylvanian Calcareous Rocks Cored in Two Wells in Rawlins and Stafford Counties, Kansas”. Bulletin (Kansas Geological Survey), no. 170 (January 1, 1964): 1–14. Accessed January 2, 2026. https://journals.ku.edu/kgsbulletin/article/view/22194.