@misc{indiciae0eee0e28020e,
  title = {Principal facts for gravity stations in Sulphur Springs Valley, Arizona},
  author = {Donald L. Peterson},
  year = {1972},
  doi = {10.3133/70043099},
  url = {https://pubs.usgs.gov/publication/70043099},
  note = {Source identifier: 70043099}
}