@misc{indiciae68cf38422e15,
  title = {Recent (2008-10) concentrations and isotopic compositions of nitrate and concentrations of wastewater compounds in the Barton Springs zone, south-central Texas, and their potential relation to urban development in the contributing zone},
  author = {Barbara Mahler and MaryLynn Musgrove and Chris Herrington and Thomas L. Sample},
  year = {2011},
  doi = {10.3133/sir20115018},
  url = {https://pubs.usgs.gov/publication/sir20115018},
  note = {Source identifier: sir20115018}
}