@misc{indiciaef0557400ce2f,
  title = {Groundwater quality in the Upper Santa Ana Watershed study unit, California},
  author = {Robert Kent and Kenneth Belitz},
  year = {2012},
  doi = {10.3133/fs20123037},
  url = {https://pubs.usgs.gov/publication/fs20123037},
  note = {Source identifier: fs20123037}
}