@misc{indiciae31d7cc8888ab,
  title = {United States earthquakes, 1950},
  author = {L.M. Murphy and F.P. Ulrich},
  year = {1984},
  doi = {10.3133/ofr84950},
  url = {https://pubs.usgs.gov/publication/ofr84950},
  note = {Source identifier: ofr84950}
}