@misc{indiciae4a1ce5d130df,
  title = {Map showing chemical quality of ground water for public supply in the Tucson area, Arizona},
  author = {W. R. Osterkamp and R. L. Laney},
  year = {1974},
  doi = {10.3133/i844l},
  url = {https://pubs.usgs.gov/publication/i844L},
  note = {Source identifier: i844L}
}