@misc{indiciaeb987f2c432e2,
  title = {Summary appraisals of the nation's ground-water resources – Lower Colorado region},
  author = {E. S. Davidson},
  year = {1979},
  doi = {10.3133/pp813r},
  url = {https://pubs.usgs.gov/publication/pp813R},
  note = {Source identifier: pp813R}
}