HILPMAN, Paul Lorenz. Producing Zones of Kansas Oil and Gas Fields. Bulletin (Kansas Geological Survey), [S. l.], p. 1–10, 1958. DOI: 10.17161/kgsbulletin.no.23585. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/23585. Acesso em: 28 apr. 2025.