@misc{indiciae03f388529d27,
  title = {On the use of space photography for identifying transportation routes; a summary of problems},
  author = {David S. Simonett and Floyd M. Henderson and Dwight D. Egbert},
  year = {1970},
  doi = {10.3133/ofr71261},
  url = {https://pubs.usgs.gov/publication/ofr71261},
  note = {Source identifier: ofr71261}
}