@misc{indiciaef74ad77d6e27,
  title = {Gridding of near vertical unrectified space photographs},
  author = {Richard H. Rapp and William H. Sprinsky},
  year = {1968},
  doi = {10.3133/ofr68222},
  url = {https://pubs.usgs.gov/publication/ofr68222},
  note = {Source identifier: ofr68222}
}