@misc{indiciaef9c7a6249330,
  title = {Spatial digital database for the geology of the San Pedro River Basin in Cochise, Gila, Graham, Pima, and Pinal Counties, Arizona},
  author = {Karen S. Bolm},
  year = {2002},
  doi = {10.3133/ofr02393},
  url = {https://pubs.usgs.gov/publication/ofr02393},
  note = {Source identifier: ofr02393}
}