@misc{indiciae6d8846ad4fd9,
  title = {Preliminary determination of epicenters; monthly listing April-June 1993},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1993},
  doi = {10.3133/ofr93600b},
  url = {https://pubs.usgs.gov/publication/ofr93600B},
  note = {Source identifier: ofr93600B}
}