@misc{indiciae3c67571044fc,
  title = {On the modified Mercalli intensities and magnitudes of the 1811/1812 New Madrid, central United States, earthquakes},
  author = {S. E. Hough and J.G. Armbruster and Leonardo Seeber and J.F. Hough},
  year = {1999},
  doi = {10.3133/ofr99565},
  url = {https://pubs.usgs.gov/publication/ofr99565},
  note = {Source identifier: ofr99565}
}