@misc{indiciaec9f6bb50c944,
  title = {Seismicity map of the State of Illinois},
  author = {C. W. Stover and B.G. Reagor and S. T. Algermissen},
  year = {1979},
  doi = {10.3133/mf1143},
  url = {https://pubs.usgs.gov/publication/mf1143},
  note = {Source identifier: mf1143}
}