@misc{indiciaec735667f8bb8,
  title = {Geohydrologic investigations of the lower Colorado River valley},
  author = {Donald G. Metzger},
  year = {1961},
  doi = {10.3133/ofr6197},
  url = {https://pubs.usgs.gov/publication/ofr6197},
  note = {Source identifier: ofr6197}
}