@misc{indiciae1c34e8edad4a,
  title = {Principal facts for gravity stations in Sulphur Springs Valley, Arizona},
  author = {Donald L. Peterson},
  year = {1966},
  doi = {10.3133/ofr66100},
  url = {https://pubs.usgs.gov/publication/ofr66100},
  note = {Source identifier: ofr66100}
}