@misc{indiciaea3831f1749a6,
  title = {Depth to bedrock in the upper San Pedro Valley, Cochise County, southeastern Arizona},
  author = {M. E. Gettings and Brenda B. Houser},
  year = {2000},
  doi = {10.3133/ofr00138},
  url = {https://pubs.usgs.gov/publication/ofr00138},
  note = {Source identifier: ofr00138}
}