@misc{indiciae85c6b1eba2da,
  title = {A general earthquake observation system (GEOS)},
  author = {Roger D. Borcherdt and Edward G. Jensen and G. Maxwell and J. B. Fletcher and R. McClearn and John R. Van Schaack and R. E. Warrick},
  year = {1983},
  url = {https://pubs.usgs.gov/publication/70234362},
  note = {Source identifier: 70234362}
}