@misc{indiciae2bc68e194ea2,
  title = {Thematic classification of multispectral image data by use of digital film recorders},
  author = {Donald B. Segal and M. Dennis Krohn},
  year = {1981},
  doi = {10.3133/ofr81275},
  url = {https://pubs.usgs.gov/publication/ofr81275},
  note = {Source identifier: ofr81275}
}