TY - RPRT TI - Sources of groundwater based on Helium analyses in and near the freshwater/saline-water transition zone of the San Antonio segment of the Edwards Aquifer, South-Central Texas, 2002-03 AU - Andrew G. Hunt AU - Rebecca B. Lambert AU - Lynne Fahlquist PY - 2010 DO - 10.3133/sir20105030 UR - https://pubs.usgs.gov/publication/sir20105030 ID - sir20105030 ER -