@misc{indiciae80d3ed971fcb,
  title = {Isotopic compositions and sources of nitrate in ground water from western Salt River Valley, Arizona},
  author = {D.J. Gellenbeck},
  year = {1994},
  doi = {10.3133/wri944063},
  url = {https://pubs.usgs.gov/publication/wri944063},
  note = {Source identifier: wri944063}
}