CUBITT, John. Geochemistry, Mineralogy, and Petrology of Upper Paleozoic Shales in Kansas. Bulletin (Kansas Geological Survey), [S. l.], n. 217, p. 1–116, 1979. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/22267.. Acesso em: 24 aug. 2024.