@misc{indiciae076cc9f04c1f,
  title = {User's guide to QPLOT, an interactive computer plotting program for earthquake and geophysical data},
  author = {Fred W. Klein},
  year = {1983},
  doi = {10.3133/ofr83621},
  url = {https://pubs.usgs.gov/publication/ofr83621},
  note = {Source identifier: ofr83621}
}