@misc{indiciae538a31d54c69,
  title = {Investigations of the New Madrid seismic zone},
  author = {A. C. Johnston},
  year = {1994},
  doi = {10.3133/pp1538fg},
  url = {https://pubs.usgs.gov/publication/pp1538FG},
  note = {Source identifier: pp1538FG}
}