@misc{indiciae61f4b98d70aa,
  title = {Preliminary simple Bouguer gravity map of northeastern Sonora, northwestern Chihuahua, and southeastern Arizona},
  author = {Consejo de Recursos Minerales (Mexico) and Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/ofr77473},
  url = {https://pubs.usgs.gov/publication/ofr77473},
  note = {Source identifier: ofr77473}
}