@misc{indiciae15f18d9a6e7b,
  title = {Ground-water recharge in the Tucson area, Arizona},
  author = {W. R. Osterkamp},
  year = {1973},
  doi = {10.3133/i844e},
  url = {https://pubs.usgs.gov/publication/i844E},
  note = {Source identifier: i844E}
}