Evaluation of productivity in the extraction of bentonite clay in the municipality of Boa Vista, state of Paraíba, Brazil. Research, Society and Development, [S. l.], v. 9, n. 9, p. e971998058, 2020. DOI: 10.33448/rsd-v9i9.8058. Disponível em: https://rsdjournal.org/rsd/article/view/8058. Acesso em: 5 dec. 2025.