PLUMMER, Norman D.; ROMARY, John F. Stratigraphy of the Pre-Greenhorn Cretaceous Beds of Kansas. Bulletin (Kansas Geological Survey), [S. l.], n. 41, p. 315–348, 1942. DOI: 10.17161/kgsbulletin.no.41.21927. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/21927. Acesso em: 16 apr. 2025.