@misc{indiciae1649be10bb9d,
  title = {Complete Bouguer gravity map of S P Mountain quadrangle, Coconino County, Arizona},
  author = {J. D. Hendricks},
  year = {1975},
  doi = {10.3133/gp905},
  url = {https://pubs.usgs.gov/publication/gp905},
  note = {Source identifier: gp905}
}