@misc{indiciaed04c15f14471,
  title = {United States earthquakes, 1977},
  author = {J.L. Coffman and C. W. Stover},
  year = {1984},
  doi = {10.3133/ofr84977},
  url = {https://pubs.usgs.gov/publication/ofr84977},
  note = {Source identifier: ofr84977}
}