@misc{indiciae05f4cfd16a54,
  title = {Seismicity map of the State of Iowa},
  author = {C. W. Stover and B.G. Reagor and S. T. Algermissen},
  year = {1981},
  doi = {10.3133/mf1324},
  url = {https://pubs.usgs.gov/publication/mf1324},
  note = {Source identifier: mf1324}
}