Frye, John C., Norman D. Plummer, Russell T. Runnels, and William B. Hladik. 1949. “Ceramic Utilization of Northern Kansas Pleistocene Loesses and Fossil Soils”. Bulletin (Kansas Geological Survey), no. 82 (January): 50-126. https://doi.org/10.17161/kgsbulletin.no.82.22013.