@misc{indiciae7b91a84f4475,
  title = {Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin ground water management area, Washington},
  author = {Lonna M. Frans and Dennis R. Helsel},
  year = {2005},
  doi = {10.3133/sir20055078},
  url = {https://pubs.usgs.gov/publication/sir20055078},
  note = {Source identifier: sir20055078}
}