@misc{indiciaeefb426984415,
  title = {Earthquakes in the United States, July-September 1981},
  author = {Carl W. Stover and J. H. Minsch and P. K. Dunbar and G. W. Baldwin},
  year = {1981},
  doi = {10.3133/cir871c},
  url = {https://pubs.usgs.gov/publication/cir871C},
  note = {Source identifier: cir871C}
}