JOHNSON, William C. Surficial geology and stratigraphy of Phillips County, Kansas, with emphasis on the Quaternary Period. Bulletin (Kansas Geological Survey), [S. l.], p. 1–66, 1993. DOI: 10.17161/kgsbulletin.no.23616. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/23616. Acesso em: 6 apr. 2025.