A conceptual hydrogeologic model for the hydrogeologic framework, geochemistry, and groundwater-flow system of the Edwards-Trinity and related aquifers in the Pecos County region, Texas - Thomas, Jonathan; Stanton, Gregory; Bumgarner, Johnathan; Pearson, Daniel K.; Teeple, Andrew; Houston, Natalie; Payne, Jason; Musgrove, MaryLynn (Fact Sheet, 2013)