@misc{indiciaea5e0c7641e67,
  title = {Preliminary determination of epicenters; monthly listing, July-September 1991},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1991},
  doi = {10.3133/ofr91600c},
  url = {https://pubs.usgs.gov/publication/ofr91600C},
  note = {Source identifier: ofr91600C}
}