@misc{indiciaeb719882c312d,
  title = {Bouguer gravity map of the Needles area, San Bernardino County, California, Mohave County, Arizona, and Clark County, Nevada},
  author = {Donald L. Peterson},
  year = {1969},
  doi = {10.3133/ofr69199},
  url = {https://pubs.usgs.gov/publication/ofr69199},
  note = {Source identifier: ofr69199}
}