@misc{indiciae37a8fe9ca76c,
  title = {PCCONTUR VERSION 1.0; a microcomputer general purpose contouring program; documentation paper copy},
  author = {Richard H. Godson and Robert E. Bracken and Michael W. Webring},
  year = {1988},
  doi = {10.3133/ofr88593a},
  url = {https://pubs.usgs.gov/publication/ofr88593A},
  note = {Source identifier: ofr88593A}
}