@misc{indiciae686643937a40,
  title = {PCCONTUR VERSION 1.0: a microcomputer general purpose contouring program, Part B - Executable PCCONTUR and test data disk},
  author = {Richard H. Godson and Robert E. Bracken and Michael W. Webring},
  year = {1988},
  doi = {10.3133/ofr88593b},
  url = {https://pubs.usgs.gov/publication/ofr88593B},
  note = {Source identifier: ofr88593B}
}