@misc{indiciae036b63da49c6,
  title = {Operation of U.S. Geological Survey unmanned digital magnetic observatories},
  author = {L.R. Wilson},
  year = {1990},
  doi = {10.1016/0031-9201(90)90207-e},
  url = {https://pubs.usgs.gov/publication/70015890},
  note = {Source identifier: 70015890}
}