@misc{indiciaeb163a5b8478c,
  title = {Flight testing the Aerial Profiling of Terrain System},
  author = {Edward J. Cyran and William H. Chapman},
  year = {1984},
  doi = {10.3133/ofr84881},
  url = {https://pubs.usgs.gov/publication/ofr84881},
  note = {Source identifier: ofr84881}
}