@misc{indiciae57a0c0cdf3d5,
  title = {The U. S. Geological Survey's gravity program in Washington, Idaho, Montana, and Wyoming},
  author = {D.P. Hill},
  year = {2014},
  doi = {10.1029/tr046i001p00214},
  url = {https://pubs.usgs.gov/publication/70221196},
  note = {Source identifier: 70221196}
}