@misc{indiciaea341c3ad929d,
  title = {HP-85 computer programs for reading Sprengnether DR-100 seismograph cassettes with DP-100 playback system},
  author = {John R. Evans and Reese Cutler},
  year = {1983},
  doi = {10.3133/ofr83521},
  url = {https://pubs.usgs.gov/publication/ofr83521},
  note = {Source identifier: ofr83521}
}