@misc{indiciae0c722dc04257,
  title = {Conversion of raster image data to vector cartographic data},
  author = {V.F. Paskevich},
  year = {1991},
  doi = {10.3133/ofr91304},
  url = {https://pubs.usgs.gov/publication/ofr91304},
  note = {Source identifier: ofr91304}
}