@misc{indiciae20cccd255c6c,
  title = {GNAP (Graphic Normative Analysis Program)},
  author = {Roger W. Bowen and John Odell},
  year = {1979},
  doi = {10.3133/ofr791211},
  url = {https://pubs.usgs.gov/publication/ofr791211},
  note = {Source identifier: ofr791211}
}