BOWDISH, Frank W. Beneficiation of Kansas Number Four Salt. Bulletin (Kansas Geological Survey), [S. l.], n. 90, p. 207–233, 1951. DOI: 10.17161/kgsbulletin.no.90.22041. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/22041. Acesso em: 6 apr. 2025.