@misc{indiciaea52f12101b14,
  title = {United States earthquakes, 1970},
  author = {J.L. Coffman and C. A. von Hake},
  year = {1984},
  doi = {10.3133/ofr84970},
  url = {https://pubs.usgs.gov/publication/ofr84970},
  note = {Source identifier: ofr84970}
}