@misc{indiciae835d2df43858,
  title = {Nitrate concentrations and potential sources in the Barton Springs segment of the Edwards aquifer and its contributing zone, Central Texas},
  author = {Barbara Mahler and MaryLynn Musgrove and Chris Herrington},
  year = {2011},
  doi = {10.3133/fs20113035},
  url = {https://pubs.usgs.gov/publication/fs20113035},
  note = {Source identifier: fs20113035}
}