@misc{indiciae4bf2d87cd165,
  title = {Marking ground targets with radio transmitters dropped from aircraft},
  author = {T.H. Nicholls and M.E. Ostry and M.R. Fuller},
  year = {1981},
  url = {https://pubs.usgs.gov/publication/5230173},
  note = {Source identifier: 5230173}
}