Landes, Kenneth K, and J.W. Ockerman. “The Geology of Mitchell and Osborne Counties, Kansas With a Chapter on ‘Rocks Not Exposed’”. Bulletin (Kansas Geological Survey), no. 16 (January 1, 1930): 1–55. Accessed December 30, 2025. https://journals.ku.edu/kgsbulletin/article/view/21844.