@misc{indiciaeb96e29e8e95d,
  title = {Programs for filing and X-Y plotting of isotopic and other data using an HP-9830 computer and HP-9862 plotter},
  author = {K.R. Ludwig},
  year = {1982},
  doi = {10.3133/ofr82385},
  url = {https://pubs.usgs.gov/publication/ofr82385},
  note = {Source identifier: ofr82385}
}