EPSTEIN, J. B. Gypsum-Karst Collapse in the Black Hills, South Dakota-Wyoming, USA. Acta Carsologica, Ljubljana, Slovenija, v. 29, n. 2, 2016. DOI: 10.3986/ac.v29i2.452. Disponível em: https://ojs.zrc-sazu.si/carsologica/article/view/452. Acesso em: 29 mar. 2024.