@misc{indiciaebc6c93c196ab,
  title = {Programs SPEKTRA and RPLOT; how to display seismic amplitude spectra and special ratios on the Eclipse},
  author = {Peter R. Stevenson},
  year = {1981},
  doi = {10.3133/ofr81830},
  url = {https://pubs.usgs.gov/publication/ofr81830},
  note = {Source identifier: ofr81830}
}