BAARS, D. L.; RITTER, Scott M.; MAPLES, C. G.; ROSS, Charles A. Redefinition of the Upper Pennsylvanian Virgilian Series in Kansas. Bulletin (Kansas Geological Survey), [S. l.], n. 230, p. 11–16, 2024. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/20481.. Acesso em: 3 jul. 2024.