CARR, Timothy R.; ANDERSON, Neil L.; PULLIAM, Tim. Case History of Walta Field (Simpson and Mississippian), Sumner County, Kansas. Bulletin (Kansas Geological Survey), [S. l.], n. 237, p. 153–157, 2024. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/20438.. Acesso em: 3 jul. 2024.