@misc{indiciae1d0f072b14e3,
  title = {The southeastern Illinois earthquake of 10 June 1987: The later aftershocks},
  author = {C.J. Langer and G. A. Bollinger},
  year = {1991},
  doi = {10.1785/bssa0810020423},
  url = {https://pubs.usgs.gov/publication/70016626},
  note = {Source identifier: 70016626}
}