@misc{indiciae9882b91aeb2c,
  title = {XYPLOT; a plotting program for the IBM PC, using Lotus 1-2-3 and a Hewlett-Packard plotter},
  author = {R.R. Schumann},
  year = {1986},
  doi = {10.3133/ofr86569b},
  url = {https://pubs.usgs.gov/publication/ofr86569B},
  note = {Source identifier: ofr86569B}
}