@misc{indiciae923b7049e259,
  title = {GEOPLOT, an advanced graphics package for minicomputers; Part II, Computer source code},
  author = {Peter L. Ward},
  year = {1983},
  doi = {10.3133/ofr83807b},
  url = {https://pubs.usgs.gov/publication/ofr83807B},
  note = {Source identifier: ofr83807B}
}