Merriam, D. F., Atkinson, W., Franks, P. C. ., Plummer, N. D., & Preston, F. (1958). Description of a Dakota (Cretaceous) Core from Cheyenne County, Kansas. Bulletin (Kansas Geological Survey), 134, 1-104. https://doi.org/10.17161/kgsbulletin.no.134.20566