TRACING NATURAL SOURCES OF F- IN GROUNDWATER: CASE NORTHERN MEXICO
GUTIERREZ, Melida, School of Earth, Environment, and Sustainability, Missouri State University, 901 S National Ave, Springfield, MO 65897-0027 and ALARCON-HERRERA, Maria Teresa, Environmental Engineering, Centro de Investigación en Materiales Avanzados, Durango, Calle CIMAV 110, Ejido Arroyo Seco, Colonia 15 de Mayo, Durango, 34147, Mexico