@misc{indiciae46e8ff5193d4,
  title = {U.S. Geological Survey magnetometer network and measurement techniques in Western U.S.A.},
  author = {R.J. Mueller and M.J.S. Johnston and B.E. Smith and V. Keller},
  year = {1980},
  doi = {10.3133/ofr811346},
  url = {https://pubs.usgs.gov/publication/ofr811346},
  note = {Source identifier: ofr811346}
}