@misc{indiciaefceb790355d1,
  title = {Responses to Iben Browning's prediction of a 1990 New Madrid, Missouri, earthquake},
  author = {William J. Spence and Robert B. Herrmann and A. C. Johnston and B.G. Reagor},
  year = {1993},
  doi = {10.3133/cir1083},
  url = {https://pubs.usgs.gov/publication/cir1083},
  note = {Source identifier: cir1083}
}