@misc{indiciaec74cdc92f04a,
  title = {Evaluation of a periscopic aircraft sextant as a surveying tool during advanced systems field test 3},
  author = {R. L. Sutton},
  year = {1968},
  doi = {10.3133/ofr68265},
  url = {https://pubs.usgs.gov/publication/ofr68265},
  note = {Source identifier: ofr68265}
}