Mattos, J.B. et al. 2017. Hydrogeochemistry typology and quality of groundwater in the urban area of municipality of Lençóis, Bahia, Brazilian northeast. Águas Subterrâneas. 31, 3 (Jul. 2017), 281–295. DOI:https://doi.org/10.14295/ras.v31i3.28852.