Frye, John C., Norman D. Plummer, Russell T. Runnels, and William B. Hladik. “Ceramic Utilization of Northern Kansas Pleistocene Loesses and Fossil Soils”. Bulletin (Kansas Geological Survey), no. 82 (January 1, 1949): 50–126. Accessed December 29, 2025. https://journals.ku.edu/kgsbulletin/article/view/22013.