@misc{indiciae735b47a5c1f1,
  title = {ISOPLOT200; a plotting and regression program for isotope geochemists, for use with HP Series 200 computers},
  author = {K.R. Ludwig},
  year = {1985},
  doi = {10.3133/ofr85513},
  url = {https://pubs.usgs.gov/publication/ofr85513},
  note = {Source identifier: ofr85513}
}