@misc{indiciaec255354221bb,
  title = {Mapsat conceptual design; system overview},
  author = {Alden P. Colvocoresses},
  year = {1981},
  doi = {10.3133/ofr8126},
  url = {https://pubs.usgs.gov/publication/ofr8126},
  note = {Source identifier: ofr8126}
}