@misc{indiciae56d7117bc5fe,
  title = {SCRNDIG a BASIC program for digitizing from a screen image on a DOS-based computer},
  author = {Philip S. Powers and Giovanni Crosta},
  year = {1992},
  doi = {10.3133/ofr92522bc},
  url = {https://pubs.usgs.gov/publication/ofr92522BC},
  note = {Source identifier: ofr92522BC}
}