@misc{indiciaeac63767f76da,
  title = {POLYGON; an interactive program for constructing and editing the geometries of polygons using a color graphics terminal},
  author = {B. A. Chuchel},
  year = {1985},
  doi = {10.3133/ofr85233a},
  url = {https://pubs.usgs.gov/publication/ofr85233A},
  note = {Source identifier: ofr85233A}
}