@misc{indiciae4fe5bd22e4e9,
  title = {Principal facts for gravity stations in the Needles area, San Bernardino County, California, Mohave County, Arizona, and Clark County, Nevada},
  author = {Donald L. Peterson},
  year = {1969},
  doi = {10.3133/ofr69200},
  url = {https://pubs.usgs.gov/publication/ofr69200},
  note = {Source identifier: ofr69200}
}