@misc{indiciae2bec0de206aa,
  title = {Preliminary determination of epicenters; monthly listing, October-December 1991},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1991},
  doi = {10.3133/ofr91600d},
  url = {https://pubs.usgs.gov/publication/ofr91600D},
  note = {Source identifier: ofr91600D}
}