@misc{indiciaed7713c29fcbb,
  title = {Principal facts for gravity stations in Safford and San Simon Valleys, Arizona},
  author = {Gordon P. Eaton and Claxton E. Timmons},
  year = {1972},
  doi = {10.3133/70043129},
  url = {https://pubs.usgs.gov/publication/70043129},
  note = {Source identifier: 70043129}
}