Jewett, John M., W.H. Schoewe, R.M. Dreyer, John C. Frye, R.P. Keroher, E. D. Kinney, Norman D. Plummer, and John F. Romary. “Kansas Mineral Resources for Wartime Industries With Other Chapters”. Bulletin (Kansas Geological Survey), no. 41 (January 1, 1942): 73–180. Accessed June 25, 2024. https://journals.ku.edu/kgsbulletin/article/view/21923.