@misc{indiciaeb6a64be11c54,
  title = {Preliminary maps showing ground-water resources in the Lower Colorado River region, Arizona, Nevada, New Mexico, and Utah},
  author = {S. G. Brown},
  year = {1976},
  doi = {10.3133/ha542},
  url = {https://pubs.usgs.gov/publication/ha542},
  note = {Source identifier: ha542}
}