@misc{indiciae5d305220c8c5,
  title = {Preliminary airworthiness and operational evaluation of an ultralight aircraft as a geological reconnaissance vehicle},
  author = {T.J. Donovan},
  year = {1984},
  doi = {10.3133/ofr84286},
  url = {https://pubs.usgs.gov/publication/ofr84286},
  note = {Source identifier: ofr84286}
}