@misc{indiciae410d8ce5fec6,
  title = {Preliminary determination of epicenters; monthly listing, January-March 1991},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1991},
  doi = {10.3133/ofr91600a},
  url = {https://pubs.usgs.gov/publication/ofr91600A},
  note = {Source identifier: ofr91600A}
}