@misc{indiciae634a8e9fa27a,
  title = {Geology and ground-water resources of the Valley of Gila River and San Simon Creek, Graham County, Arizona},
  author = {Maxwell M. Knechtel and E. W. Lohr},
  year = {1938},
  doi = {10.3133/wsp796f},
  url = {https://pubs.usgs.gov/publication/wsp796F},
  note = {Source identifier: wsp796F}
}